Common use of NOTICE OF EXERCISE OF WARRANT Clause in Contracts

NOTICE OF EXERCISE OF WARRANT. The undersigned hereby irrevocably elects to exercise the right, represented by the Warrant dated as of ______________, __________________, to purchase shares of the Common Stock, $0.005 par value, of ENSERVCO CORPORATION and tenders herewith payment in accordance with said Common Stock Purchase Warrant. _ CASH: $ _______________________ = (Exercise Price x Exercise Shares) Payment is being made by: _ enclosed check _ wire transfer _ wire transfer _ OTHER: _______________________ (describe) I understand that I may only exercise this Warrant if there is a registration statement relating to the exercise of this Warrant that is effective under federal and applicable state law, or alternatively if there is an exemption from registration available under federal and applicable state (which exemption must be established to the satisfaction of the Company). In each case, I understand that the Company may require that I provide it information regarding my financial status, state of residence, and other information necessary to determine whether the exercise is subject to an effective registration statement or to determine whether an applicable exemption is available. To the extent required by the Company to establish an exemption from registration, I will provide the Company information as to my status as an accredited investor and execute a subscription agreement in the form requested by the Company provided that form is reasonably consistent with industry custom and practice. Please deliver the stock certificate to: Dated: [Name of Holder] By:

NOTICE OF EXERCISE OF WARRANT. The undersigned hereby irrevocably elects to exercise the right, represented by the Warrant dated as of ____________________, __________, to purchase __________________, to purchase __ shares of the Common Stock, $0.005 .0001 par value, of ENSERVCO CORPORATION LIFELINE THERAPEUTICS, INC. and tenders herewith payment in accordance with Section 1 of said Common Stock Purchase Warrant. _ CASH: $ ______________________________________________ = (Exercise Price x Exercise Shares) Payment is being made by: _ enclosed check _ wire transfer _ wire transfer _ OTHER: _______________________ (describe) enclosed check _____ wire transfer _____ other I understand that I may only exercise this Warrant if there is a registration statement relating to the exercise of this Warrant that is effective under federal and applicable state law, or alternatively if there is an exemption from registration available under federal and applicable state (which exemption must be established to the satisfaction of the CompanyLifeline Therapeutics, Inc.). In each case, I understand that the Company Lifeline Therapeutics, Inc. may require that I provide it information regarding my financial status, state of residence, and other information necessary to determine whether the exercise is subject to an effective registration statement or to determine whether an applicable exemption is available. To The undersigned represents to Lifeline Therapeutics that it is an “accredited investor” as defined in Regulation D promulgated under the extent required Securities Act of 1933, as amended. The undersigned further represents and warrants that it has reviewed all of the reports filed by the Company to establish an exemption from registrationwith the Securities and Exchange Commission, I will provide the press releases issued by the Company, and such other information regarding the Company information as to my status as an accredited investor and execute a subscription agreement it has determined appropriate or necessary in the form requested by circumstances, that it has received such additional information regarding the Company provided that form is reasonably consistent it has requested, and that it has consulted with industry custom its legal, tax, investment, financial, and practiceother advisors regarding the exercise described in this Notice of Exercise. Please deliver the stock certificate to: ___________________________________________________ ___________________________________________________ ___________________________________________________ Dated: ________________________________________ ____________________________________________ [Name of Holder] By:: _________________________________________

NOTICE OF EXERCISE OF WARRANT. The undersigned hereby irrevocably elects to exercise the right, represented by the Warrant dated as of ____________________, __________, to purchase __________________, to purchase __ shares of the Common Stock, $0.005 .0001 par value, of ENSERVCO CORPORATION LIFELINE THERAPEUTICS, INC. and tenders herewith payment in accordance with Section 1 of said Common Stock Purchase Warrant. _ CASH: $ ______________________________________________ = (Exercise Price x Exercise Shares) Payment is being made by: _ enclosed check _ wire transfer _ wire transfer _ OTHER: _______________________ (describe) enclosed check _____ wire transfer _____ other I understand that I may only exercise this Warrant if there is a registration statement relating to the exercise of this Warrant that is effective under federal and applicable state law, or alternatively if there is an exemption from registration available under federal and applicable state (which exemption must be established to the satisfaction of the CompanyLifeline Therapeutics, Inc.). In each case, I understand that the Company Lifeline Therapeutics, Inc. may require that I provide it information regarding my financial status, state of residence, and other information necessary to determine whether the exercise is subject to an effective registration statement or to determine whether an applicable exemption is available. To The undersigned represents to Lifeline Therapeutics that it is an “accredited investor” as defined in Regulation D promulgated under the extent required Securities Act of 1933, as amended. The undersigned further represents and warrants that it has reviewed all of the reports filed by the Company to establish an exemption from registrationwith the Securities and Exchange Commission, I will provide the press releases issued by the Company, and such other information regarding the Company information as to my status as an accredited investor and execute a subscription agreement it has determined appropriate or necessary in the form requested by circumstances, that it has received such additional information regarding the Company provided that form is reasonably consistent it has requested, and that it has consulted with industry custom its legal, tax, investment, financial, and practiceother advisors regarding the exercise described in this Notice of Exercise. Please deliver the stock certificate to: ___________________________________________________ ___________________________________________________ ___________________________________________________ Dated: __________________________________ _______________________________________ [Name of Holder] By:: ____________________________________

NOTICE OF EXERCISE OF WARRANT. The undersigned hereby irrevocably elects to exercise the right, represented by the Warrant Agreement dated as of ____________ ___, 20__________________, _ to purchase shares of the Common Stock, $0.005 par value, of ENSERVCO CORPORATION and tenders herewith payment in accordance with said Common Stock Purchase Warrant. _ CASH: $ _______________________ shares of the Common Stock of PROTOKINETIX, INCORPORATED at an exercise price of US $_________ per share, and tenders herewith payment in accordance with said Warrant Agreement. _ CASH: US $ = (Exercise Price x Exercise Warrant Shares) Payment is being made by: _ enclosed check _ wire transfer _ wire transfer _ OTHER: _______________________ (describe) I understand that I may only exercise this Warrant if there is a registration statement relating to the exercise of this Warrant that is effective under federal federal, applicable state law and applicable state non-U.S. law, or alternatively alternatively, if there is an exemption from registration available under federal federal, applicable state law, and applicable state non-U.S. law (which exemption must be established to the satisfaction of the CompanyProtoKinetix, Incorporated). In each caseI represent that all representations and warranties made by me in the Subscription Agreement dated _____ ____, 20__ are true and correct as of the date of this notice. I understand that the Company ProtoKinetix, Incorporated may require that I provide it information regarding my financial status, state of residence, and other information necessary to determine whether the exercise is subject to an effective registration statement or to determine whether an applicable exemption is available. To the extent required by the Company to establish an exemption from registration, I will provide the Company information as to my status as an accredited investor and execute a subscription agreement in the form requested by the Company provided that form is reasonably consistent with industry custom and practice. Please Alternatively, I understand that I may deliver a legal opinion regarding the availability of an exemption from such registration, which legal opinion must be acceptable to ProtoKinetix, Incorporated in its reasonable discretion. I understand that ProtoKinetix, Incorporated will issue the shares subject to this exercise in electronic form only and I will not receive a physical stock certificate to: Dated: [Name of Holder] Bycertificate. Signed:________________________ Date:__________________

NOTICE OF EXERCISE OF WARRANT. The undersigned hereby irrevocably elects to exercise the right, represented by the Warrant Agreement dated as of ____________ ___, 20___ to purchase __________________, to purchase _ shares of the Common StockStock of GAUCHO GROUP HOLDINGS, INC. at an exercise price of US $0.005 par value0.50 per share, of ENSERVCO CORPORATION and tenders herewith payment in accordance with said Common Stock Purchase WarrantWarrant Agreement. _ CASH: US $ _____________________________________ = (Exercise Price x Exercise Warrant Shares) Payment is being made by: _ enclosed check _ wire transfer _ wire transfer _ OTHER: _______________________ (describe) I understand that I may only exercise this Warrant if there is a registration statement relating to the exercise of this Warrant that is effective under federal federal, applicable state law and applicable state non-U.S. law, or alternatively alternatively, if there is an exemption from registration available under federal federal, applicable state law, and applicable state non-U.S. law (which exemption must be established to the satisfaction of the CompanyGaucho Group Holdings, Inc.). In each case, I understand that the Company Gaucho Group Holdings, Inc. may require that I provide it information regarding my financial status, state of residence, and other information necessary to determine whether the exercise is subject to an effective registration statement or to determine whether an applicable exemption is available. To the extent required by the Company to establish an exemption from registration, I will provide the Company information as to my status as an accredited investor and execute a subscription agreement in the form requested by the Company provided that form is reasonably consistent with industry custom and practice. Please Alternatively, I understand that I may deliver a legal opinion regarding the availability of an exemption from such registration, which legal opinion must be acceptable to Gaucho Group Holdings, Inc. in its reasonable discretion. I understand that Gaucho Group Holdings, Inc. may issue the shares subject to this exercise in electronic form only and, in such case, I will not receive a physical stock certificate tocertificate. Signed: Dated: [Name of Holder] ByDate:

NOTICE OF EXERCISE OF WARRANT. The undersigned hereby irrevocably elects to exercise the right, represented by the Amended and Restated Warrant Agreement dated as of ____________ ___, 20___ to purchase __________________, to purchase _ shares of the Common StockStock of GAUCHO GROUP HOLDINGS, INC. at an exercise price of US $0.005 par value0.50 per share, of ENSERVCO CORPORATION and tenders herewith payment in accordance with said Common Stock Purchase WarrantAmended and Restated Warrant Agreement. _ CASH: $ _______US $________________ = (Exercise Price x Exercise Warrant Shares) Payment is being made by: _ enclosed check _ wire transfer _ wire transfer _ OTHER: _______________________ (describe) I understand that I may only exercise this Warrant if there is a registration statement relating to the exercise of this Warrant that is effective under federal federal, applicable state law and applicable state non-U.S. law, or alternatively alternatively, if there is an exemption from registration available under federal federal, applicable state law, and applicable state non-U.S. law (which exemption must be established to the satisfaction of the CompanyGaucho Group Holdings, Inc.). In each case, I understand that the Company Gaucho Group Holdings, Inc. may require that I provide it information regarding my financial status, state of residence, and other information necessary to determine whether the exercise is subject to an effective registration statement or to determine whether an applicable exemption is available. To the extent required by the Company to establish an exemption from registration, I will provide the Company information as to my status as an accredited investor and execute a subscription agreement in the form requested by the Company provided that form is reasonably consistent with industry custom and practice. Please Alternatively, I understand that I may deliver a legal opinion regarding the availability of an exemption from such registration, which legal opinion must be acceptable to Gaucho Group Holdings, Inc. in its reasonable discretion. I understand that Gaucho Group Holdings, Inc. may issue the shares subject to this exercise in electronic form only and, in such case, I will not receive a physical stock certificate to: Dated: [Name of Holder] Bycertificate. Signed:________________________ Date:__________________

NOTICE OF EXERCISE OF WARRANT. The undersigned hereby irrevocably elects to exercise the right, represented by the Warrant dated as of ____________________, __________, to purchase __________________, to purchase __ shares of the Common Stock, $0.005 .0001 par value, of ENSERVCO CORPORATION LIFELINE THERAPEUTICS, INC. and tenders herewith payment in accordance with Section 1 of said Common Stock Purchase Warrant. _ CASH: $ ______________________________________________ = (Exercise Price x Exercise Shares) Payment is being made by: _ enclosed check _ wire transfer _ wire transfer _ OTHER: _______________________ (describe) enclosed check _____ wire transfer _____ other I understand that I may only exercise this Warrant if there is a registration statement relating to the exercise of this Warrant that is effective under federal and applicable state law, or alternatively if there is an exemption from registration available under federal and applicable state (which exemption must be established to the satisfaction of the CompanyLifeline Therapeutics, Inc.). In each case, I understand that the Company Lifeline Therapeutics, Inc. may require that I provide it information regarding my financial status, state of residence, and other information necessary to determine whether the exercise is subject to an effective registration statement or to determine whether an applicable exemption is available. To The undersigned represents to Lifeline Therapeutics that it is an “accredited investor” as defined in Regulation D promulgated under the extent required Securities Act of 1933, as amended. The undersigned further represents and warrants that it has reviewed all of the reports filed by the Company to establish an exemption from registrationwith the Securities and Exchange Commission, I will provide the press releases issued by the Company, and such other information regarding the Company information as to my status as an accredited investor and execute a subscription agreement it has determined appropriate or necessary in the form requested by circumstances, that it has received such additional information regarding the Company provided that form is reasonably consistent it has requested, and that it has consulted with industry custom its legal, tax, investment, financial, and practiceother advisors regarding the exercise described in this Notice of Exercise. Please deliver the stock certificate to: ___________________________________________________ ___________________________________________________ ___________________________________________________ Dated: _____________________________________ _________________________________________ [Name of Holder] By:: ______________________________________

NOTICE OF EXERCISE OF WARRANT. The undersigned hereby irrevocably elects to exercise the right, represented by the Amended and Restated Warrant Agreement dated as of ____________ ___, 20___ to purchase __________________, to purchase _ shares of the Common StockStock of GAUCHO GROUP HOLDINGS, INC. at an exercise price of US $0.005 par value0.50 per share, of ENSERVCO CORPORATION and tenders herewith payment in accordance with said Common Stock Purchase WarrantAmended and Restated Warrant Agreement. _ CASH: US $ _______________________ = (Exercise Price x Exercise Warrant Shares) Payment is being made by: _ enclosed check _ wire transfer _ wire transfer _ OTHER: _______________________ (describe) I understand that I may only exercise this Warrant if there is a registration statement relating to the exercise of this Warrant that is effective under federal federal, applicable state law and applicable state non-U.S. law, or alternatively alternatively, if there is an exemption from registration available under federal federal, applicable state law, and applicable state non-U.S. law (which exemption must be established to the satisfaction of the CompanyGaucho Group Holdings, Inc.). In each case, I understand that the Company Gaucho Group Holdings, Inc. may require that I provide it information regarding my financial status, state of residence, and other information necessary to determine whether the exercise is subject to an effective registration statement or to determine whether an applicable exemption is available. To the extent required by the Company to establish an exemption from registration, I will provide the Company information as to my status as an accredited investor and execute a subscription agreement in the form requested by the Company provided that form is reasonably consistent with industry custom and practice. Please Alternatively, I understand that I may deliver a legal opinion regarding the availability of an exemption from such registration, which legal opinion must be acceptable to Gaucho Group Holdings, Inc. in its reasonable discretion. I understand that Gaucho Group Holdings, Inc. may issue the shares subject to this exercise in electronic form only and, in such case, I will not receive a physical stock certificate to: Dated: [Name of Holder] Bycertificate. Signed:________________________ Date:__________________