0001193125-11-351906 Sample Contracts

ARDEA BIOSCIENCES, INC. and , AS WARRANT AGENT FORM OF COMMON STOCK WARRANT AGREEMENT

Common Stock Warrant Agreement • December 23rd, 2011 • Ardea Biosciences, Inc./De • Pharmaceutical preparations • New York

• Contract Type
  Common Stock Warrant Agreement
• Filed
  December 23rd, 2011
• Company
  Ardea Biosciences, Inc./De
• Industry
  Pharmaceutical preparations
• Jurisdiction
  New York

COMMON STOCK WARRANT AGREEMENT (this “Agreement”), dated as of between ARDEA BIOSCIENCES, INC., a Delaware corporation (the “Company”) and, a [corporation] [national banking association] organized and existing under the laws of and having a corporate trust office in , as warrant agent (the “Warrant Agent”).

ARDEA BIOSCIENCES, INC. and , AS WARRANT AGENT FORM OF DEBT SECURITIES WARRANT AGREEMENT

Warrant Agreement • December 23rd, 2011 • Ardea Biosciences, Inc./De • Pharmaceutical preparations • New York

• Contract Type
  Warrant Agreement
• Filed
  December 23rd, 2011
• Company
  Ardea Biosciences, Inc./De
• Industry
  Pharmaceutical preparations
• Jurisdiction
  New York

DEBT SECURITIES WARRANT AGREEMENT (this “Agreement”), dated as of between ARDEA BIOSCIENCES, INC., a Delaware corporation (the “Company”) and , a [corporation] [national banking association] organized and existing under the laws of and having a corporate trust office in , as warrant agent (the “Warrant Agent”).

ARDEA BIOSCIENCES, INC. and , AS WARRANT AGENT FORM OF PREFERRED STOCK WARRANT AGREEMENT

Preferred Stock Warrant Agreement • December 23rd, 2011 • Ardea Biosciences, Inc./De • Pharmaceutical preparations • New York

• Contract Type
  Preferred Stock Warrant Agreement
• Filed
  December 23rd, 2011
• Company
  Ardea Biosciences, Inc./De
• Industry
  Pharmaceutical preparations
• Jurisdiction
  New York

PREFERRED STOCK WARRANT AGREEMENT (this “Agreement”), dated as of between ARDEA BIOSCIENCES, INC., a Delaware corporation (the “Company”) and , a [corporation] [national banking association] organized and existing under the laws of and having a corporate trust office in , as warrant agent (the “Warrant Agent”).

ARDEA BIOSCIENCES, INC. AND [TRUSTEE], TRUSTEE FORM OF SUBORDINATED DEBT INDENTURE

Ardea Biosciences, Inc./De • December 23rd, 2011 • Pharmaceutical preparations • New York

• Company
  Ardea Biosciences, Inc./De
• Filed
  December 23rd, 2011
• Industry
  Pharmaceutical preparations
• Jurisdiction
  New York

INDENTURE, dated as of , 20 , among ARDEA BIOSCIENCES, INC., a Delaware corporation (the “Company”), and [TRUSTEE], as trustee (the “Trustee”):

ARDEA BIOSCIENCES, INC. ISSUER AND [TRUSTEE], TRUSTEE FORM OF SENIOR DEBT INDENTURE

Ardea Biosciences, Inc./De • December 23rd, 2011 • Pharmaceutical preparations • New York

• Company
  Ardea Biosciences, Inc./De
• Filed
  December 23rd, 2011
• Industry
  Pharmaceutical preparations
• Jurisdiction
  New York

INDENTURE, dated as of , 20 , among ARDEA BIOSCIENCES, INC., a Delaware corporation (the “Company”), and [TRUSTEE], as trustee (the “Trustee”):