Synonyms: 4-Thia-1-azabicyclo[3.2.0]heptane-2-carboxylicacid, 6-[(aminophenylacetyl)amino]-3,3-dimethyl-7-oxo-,1,3-dihydro-3-oxo-1-isobenzofuranyl ester, [2S-[2a,5a,6b(S*)]]-;4-Thia-1-azabicyclo[3.2.0]heptane-2-carboxylic acid, 6-[[(2R)-aminophenylacetyl]amino]-3,3-dimethyl-7-oxo-,1,3-dihydro-3-oxo-1-isobenzofuranyl ester, (2S,5R,6R)- (9CI); 3-PhthalidylD-2-amino-2-phenylacetamidopenicillanic acid; Ampicillin phthalidyl ester;Talampicillin