Synonyms: 4-Thia-1-azabicyclo[3.2.0]heptane-2-carboxylicacid, 6-(2,2-dimethyl-5-oxo-4-phenyl-1-imidazolidinyl)-3,3-dimethyl-7-oxo-,monopotassium salt (8CI); 4-Thia-1-azabicyclo[3.2.0]heptane-2-carboxylic acid,6-(2,2-dimethyl-5-oxo-4-phenyl-1-imidazolidinyl)-3,3-dimethyl-7-oxo-,monopotassium salt, [2S-[2a,5a,6b(S*)]]-;4-Thia-1-azabicyclo[3.2.0]heptane-2-carboxylic acid,6-[(4R)-2,2-dimethyl-5-oxo-4-phenyl-1-imidazolidinyl]-3,3-dimethyl-7-oxo-,monopotassium salt, (2S,5R,6R)- (9CI); Hetacillin potassium; Hetacillinpotassium salt; HetacinK; Natacillin; Potassium6-(2,2-dimethyl-5-oxo-4-phenyl-1-imidazolidinyl)-3,3-dimethyl-7-oxo-4-thia-1-azabicyclo[3.2.0]heptane-2-carboxylate;Potassium hetacillin; Uropen; Versapen K