CAS 3056-93-7 appears in our catalog under these names: Basic Orange 21, ASTRAZON ORANGE G, 2-Methyl-3-(2-(1,3,3-trimethylindolin-2-ylidene)ethylidene)-3H-indole hydrochloride, Carbon 30%-60%,RG, Carbon 30%-60%,RG. Offered by: Dr. Ehrenstorfer, Sigma-Aldrich, Chemat. Available pack sizes: 50mg, 100G, 1g, 5g, 25g.