Synonyms: 3-Phorbinepropanoic acid, 21-carboxy-9-ethenyl-14-ethyl-13-formyl-4,8,18-trimethyl-20-oxo-, (3S,4S,21R)-;(3S(alpha4beta,21beta))-21-Carboxy-14-ethyl-13-formyl-4,8,18-trimethyl-20-oxo-9-vinylphorbine-3-propionic acid;(3S,4S,21R)-3-(2-carboxyethyl)-9-ethenyl-14-ethyl-13-formyl-4,8,18-trimethyl-20-oxo-24,25-dihydrophorbine-21-carboxylic acid