CAS 118081-33-7 appears in our catalog under these names: Collagenase Chromophore–Substrate, Collagenase Chromophore-Substrate Component A, 95.00%, COLLAGENASE CHROMOPHORE-SUBSTRATE (FOR &. Offered by: GLPBio, Chemat, Sigma-Aldrich. Available pack sizes: 10mg, 50mg, 100MG.