PIVAMPICILLIN EPP(CRM STANDARD)

ampicillinpivaloyloxymethylester

hydroxymethylester,pivalate(ester),d-(-)-do)-3-dimethyl-7-oxo-

4-thia-1-azabicyclo(3.2.0)heptane-2-carboxylicacid,6-(2-amino-2-phenylacetami