"Ampicillin Pivaloyl Ester"@en . "D010917" . "Pivampicillin"@en . . "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, (2S-(2alpha,5alpha,6beta(S*)))-"@en . . "C0032032" . . . "Pivampicillin"@en . . .