Our catalysts are as selective as you are - C&EN Global Enterprise

CLECs™ are selective, stable, active, heterogeneous catalysts.

Our catalysts are as selective as you are. CLEC™ Catalysts for Regio-, Chemo- and Stereospecific Chemistry Choose CLEC Catalysts for:

Choose Altus for:

Acylations via • Aminolysis • Esterification • Lactonization • Transesterification

• • • •

Hydrolysis of Amides, Esters, Lactones, Thiol Esters Mild protection/deprotection of Acids, Alcohols, Amines, Carbohydrates, Peptides, Nucleosides, Steroids, Thiols Peptide Synthesis of Natural, Unnatural, Peptide Segments Resolution of Chiral Acids, Alcohols, Amides, Amines, Amino Acids (Natural and Unnatural), Amino Phosphonic Acids, Anhydrides, Carbohydrates, Epoxides, Esters, Hydroxy Acids, Lactams, Lactones, Thiols, Peroxides CIRCLE 1 7 ON READER SERVICE CARD

Selective Chemical Catalysts Cost Effective Solutions Timely Technical Support Outstanding Customer Service

Altus Biologies Inc. 40 Allston Street Cambridge, MA 02139-4211 USA Telephone: (617) 499-0500 Facsimile: (617) 499-2480 Internet: [email protected] CLEC is a trademark of Altus Biologies Inc. © 1 9 9 5 Altus Biologies Inc., a subsidiary of Vertex Pharmaceuticals Incorporated.