PROBLEM TO BE SOLVED: To provide a crystal form of specific modification of 8-cyano-1-cyclopropyl-7-(1S,6S-2,8-diazabicyclo[4.3.0]nonan-8-yl)-6-fluoro-1,4-dihydro-4-oxo-3-quinoline carboxylic acid (CCDC) easily handleable in pharmaceutical preparation.SOLUTION: There are disclosed the crystal modification B of formula (I), production method therefor and use thereof in the pharmaceutical preparation.COPYRIGHT: (C)2013,JPO&INPIT【課題】製薬学的調製において取り扱い易い8-シアノ-1-シクロプロピル-7-(1S,6S-2,8-ジアザビシクロ[4.3.0]ノナン-8-イル)-6-フルオロ-1,4-ジヒドロ-4-オキソ-3-キノリンカルボン酸(CCDC)の限定された変態の結晶形の提供。【解決手段】式(I)の結晶変態B、その製造法及び製薬学的調製物中におけるその使用。【選択図】図1