CAS 522-75-8 appears in our catalog under these names: Thioindigo, Thioindigo 98%, 2-(3-Oxobenzo[b]thien-2(3H)-ylidene)benzo[b]thiophen-3(2H)-one, 97%, 97%, Thioindigo, 97%. Offered by: TRC, GLPBio, TCI, Ambeed, Chemat. Available pack sizes: 100mg, 100g, 25g, 5g, 500g.