61462-94-0 DL-Phenylalanine, beta-(3-bromo-1-oxopropoxy)-N-(3-bromo-1-oxopropyl)-, ethyl ester, erythro- erythro-beta-(3-Bromo-1-oxopropoxy)-N-(3-bromo-1-oxopropyl)-DL-phenylalanine ethyl ester