Synonyms: 4-Thia-1-azabicyclo[3.2.0]heptane-2-carboxylicacid, 6-(2-amino-2-phenylacetamido)-3,3-dimethyl-7-oxo-, hydroxymethyl esterpivalate (ester), monohydrochloride, D- (8CI);4-Thia-1-azabicyclo[3.2.0]heptane-2-carboxylic acid,6-[(aminophenylacetyl)amino]-3,3-dimethyl-7-oxo-,(2,2-dimethyl-1-oxopropoxy)methyl ester, monohydrochloride, [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-, (2,2-dimethyl-1-oxopropoxy)methylester, monohydrochloride, (2S,5R,6R)- (9CI); Methanediol,6-(2-amino-2-phenylacetamido)-3,3-dimethyl-7-oxo-4-thia-1-azabicyclo[3.2.0]heptane-2-carboxylatepivalate (ester) monohydrochloride (8CI); Pivalic acid, hydroxymethyl ester 6-(2-amino-2-phenylacetamido)-3,3-dimethyl-7-oxo-4-thia-1-azabicyclo[3.2.0]heptane-2-carboxylatemonohydrochloride (8CI); Alphacilina; Alphacillin; Ampicillin pivaloxyoxymethylester hydrochloride; Ampicillin pivaloyloxymethyl ester hydrochloride; Berocillin;Centurina; Diancina; In