L-TRYPTOPHAN BUTYL ESTER HYDROCHLORIDE L-TRYPTOPHAN T-BUTYL ESTER HYDROCHLORIDE H-TRP-OTBU HCL TRYPTOPHAN-OTBU HCL L-Trp-OtBu·HCl L-Tryptophantert-butyl ester hydrochloride≥ 95% (HPLC) H-Trp-OtBu (S)-tert-Butyl 2-aMino-3-(1H-indol-3-yl)propanoate