| abstract |
Crystalline (+)-(5R,6S)-6-[(R)-1-hydroxyethyl]-3-(3-pyridyl)-7-oxo-4-thia-1-azabicyclo[3.2.0]hept-2-ene-2-carboxylic acid pivalcyloxymethyl 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 Å according to powder X-ray diffraction is disclosed. The crystalline penem compound is useful for an antibacterial agent. |