CRYSTALLINE PENEM, ITS PRODUCTION AND USE

摘要

of the disclosure CRYSTALLINE PENEM, ITS PRODUCTION AND USE Crystalline (+)-(5R,6S)-6-(R)-1-hydroxyethyl!-3- (3-pyridyl)-7-oxo-4-thia-1-azabicyclo3.2.0!hept-2-ene-2-carboxylic acid pivaloyloxymethyl ester having a diffraction pattern which shows main peaks at spacing of 12.8, 8.8, 5.6, 4.44, 4.36, and 4.2 .ANG. according to powder X-ray diffraction is disclosed. The crystalline penem compound is useful for an antibacterial agent. .