CAS 4350-09-8 appears in our catalog under these names: Tryptophan EP Impurity D, 5-Hydroxy L-Tryptophan, >95% (HPLC), (S)-2-Amino-3-(5-hydroxy-1H-indol-3-yl)propanoic Acid (5-Hydroxytryptophan), L-5-Hydroxytryptophan hydrate, 98% , 5-Hydroxy-L-tryptophan, 99.00%. Offered by: Chemat Brand, TRC, Mikromol, Thermo Scientific (Alfa Aesar), Chemat. Available pack sizes: on request, 100mg, 1g, 250mg, 5g, 100g, 250g, 25g.