CAS 1953-54-4 appears in our catalog under these names: 5-Hydroxyindole, 98%, 5-Hydroxyindole, 5-Hydroxyindole, >95% (HPLC), 5–Hydroxyindole, 5-Hydroxyindole, 98+% . Offered by: Combi-blocks, Chemat Brand, TRC, GLPBio, Thermo Scientific (Alfa Aesar). Available pack sizes: 25g, 5g, 1g, 100g, on request, 500mg, 100mg, 50g.