EXHIBIT 10.23 AMENDMENT TO AGREEMENT WHEREAS, CheMatch.com, Inc. (formerly known as PetroChemNet Holdings, Inc.), hereinafter "PCN, CheMatch, or the Company" and E.I. duPont de Nemours and Company, hereinafter "DuPont", entered into a certain...Strategic Alliance Agreement • May 17th, 2000 • Chematch Com Inc • Services-business services, nec
