LK-PENICILLIN IN PENICILLIN G THE DERIVATIVES;GEO: PENICILLIN-G-P-METHOXYBENZYL ESTER SULFOXIDE;PENICILLIN G SULFOXIDE P-METHOXYBENZYL ESTER;3,3-dimethyl-4-oxo-6-[(1-oxo-2-phenylethyl)amino]-4$l^{4}-thia-1-azabicyclo[3.2.0]heptane-2-carboxylic acid (4-methoxyphenyl)methyl ester;LK-Penicillin In Penicillin G Th;LK-PENICILLIN IN PENICILLIN G THE DERIVATIVES USP/EP/BP;Penicillin-G 4-methoxybenzyl;Benzylpenicillin Impurity 31
