6-beta(substituted)-(S)-hydroxymethylpenicillanic acids and derivatives thereof
Antibacterial penicillins of the formula STR1 or a pharmaceutically acceptable salt thereof wherein R1 is a heterocyclic group and R is hydrogen, the residue of certian carboxy protecting groups or the residue of an ester group readily hydrolyzable in vivo having activity against resistant organisms.
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(2008/06/13)
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