| abstract |
A novel crystal of a pyrrolidylthiocarbapenem derivative having excellent stability is provided. According to the present invention, a crystal of (+)-(4R,5S,6S)-6-Ä(1R)-1-hydroxyethylÜ-4-methyl-7-oxo-3 ÄÄ(3S,5S)-5-(sulfamoylaminomethyl)pyrrolidin-3-ylÜthioÜ -1-azabicycloÄ3.2.0Ühept-2-ene-2-carboxylic acid having a diffraction pattern in powder X-ray diffraction preferably having main peaks at diffraction angles (2θ) = 13.04, 14.98, 15.88, 16.62, 20.62, 21.06, 22.18, 23.90, 26.08, 28.22 and 28.98 (degrees) is provided. |