CNST Constellation Pharmaceuticals Inc

Constar International Inc. (NASDAQ:CNST), a leading producer of PET (polyethylene terephthalate) bottles for the beverage and food markets will present an update on the development of DiamondClear(TM) oxygen scavenging technology at the PET Strategies Conference scheduled for November 29- December 1, 2005, hosted by Packaging Strategies. DiamondClear is an excellent oxygen scavenging material that is blended in a monolayer PET bottle. Michael Hoffman, Constar's President and CEO commented, "DiamondClear represents a breakthrough in PET oxygen scavenging technology by offering both the clarity of glass and an economical monolayer structure. We believe DiamondClear is the right answer for food and beverage brand owners that are looking to transition their oxygen sensitive products to consumer friendly PET." As the DiamondClear material is blended at the preform injection stage, the technology works equally well with one-step and two-step injection stretch blow molding operations, eliminating the need for high cost co-injection equipment necessary for multi-layer barrier systems. And, unlike systems to apply internal or external barrier coatings, DiamondClear preforms can be produced centrally and economically shipped to any blowing location. Constar believes that "barrier in the preform" solutions provide scalability and flexibility that broadens the potential of this new technology. Unlike currently available monolayer scavenger systems, DiamondClear produces a bottle with clarity equal to plain PET and with higher gloss. About Constar: Philadelphia based Constar International Inc. is a leading global producer of PET (polyethylene terephthalate) plastic containers for food, soft drinks and water. The company provides full service packaging solutions, from product design and engineering to ongoing customer support. Its customers include many of the world's leading branded consumer products companies. Cautionary Note Regarding Forward-Looking Statements Except for historical information, all information in this press release consists of forward-looking statements within the meaning of the federal securities laws. These forward-looking statements involve a number of risks, uncertainties and other factors, which may cause the actual results to be materially different from those expressed or implied in the forward-looking statements. Important factors that could cause the statements in this release to differ include the successful commercialization of DiamondClear technology and the obtainment of all required regulatory approvals. Other important factors are discussed under the caption "Cautionary Statement Regarding Forward Looking Statements" in the Company's Form 10-K Annual Report for the year ended December 31, 2004 and in subsequent filings with the Securities and Exchange Commission made prior to or after the date hereof. The Company does not intend to review or revise any particular forward-looking statement in light of future events.