(5-cyano-6-fluoro-8-methyl-1-propyl-3,4-dihydro-1H-[1]benzothieno[2,3-c]pyran-1-yl)acetic acid 生成 [(1S)-5-cyano-6-fluoro-8-methyl-1-propyl-3,4-dihydro-1H-[1]benzothieno[2,3-c]pyran-1-yl]acetic acid 、 [(1R)-5-cyano-6-fluoro-8-methyl-1-propyl-3,4-dihydro-1H-[1]benzothieno[2,3-c]pyran-1-yl]acetic acid