Pivcefalexina, (Pivaloyloxy)methyl (6R-(6alpha,7beta(R*)))-7-(2-amino-2-phenylacetamido)-3-methyl-8-oxo-5-thia-1-azabicyclo(4.2.0)oct-2-ene-2-carboxylate monohydrochloride, ST-21, Pivcefalexin HCl, Pivcefalexin hydrochloride, Pivcephalexin, EINECS 248-622-3, 5-Thia-1-azabicyclo(4.2.0)oct-2-ene-2-carboxylic acid,7-(2-amino-2-phenylacetamido)-3-methyl-8-oxo-,pivaloyloxymethyl ester,hydrochloride,D, Sigmacef, Pivcefalexina [Spanish]