Synonyms: 4-Thia-1-azabicyclo[3.2.0]heptane-2-carboxylicacid, 3,3-dimethyl-6-[2-(methyleneamino)-2-phenylacetamido]-7-oxo-, monosodiumsalt, D-(-)- (8CI); 4-Thia-1-azabicyclo[3.2.0]heptane-2-carboxylic acid,3,3-dimethyl-6-[[(2R)-(methyleneamino)phenylacetyl]amino]-7-oxo-, monosodiumsalt, (2S,5R,6R)- (9CI); 4-Thia-1-azabicyclo[3.2.0]heptane-2-carboxylic acid,3,3-dimethyl-6-[[(methyleneamino)phenylacetyl]amino]-7-oxo-, monosodium salt,[2S-[2a,5a,6b(S*)]]-; Bonopen; Lancilline; Metampicillin sodium; Methyleneampicillinsodium salt; Sodium metampicillin; Sodium methyleneampicillin; Suvipen