ethyl 1-[6-chloro-2-(1H-imidazol-5-ylcarbonyl)-2,3,4,9-tetrahydro-1H-β-carbolin-1-yl]cyclobutanecarboxylate hydrochloride 生成 ethyl (1S)-1-[6-chloro-2-(1H-imidazol-5-ylcarbonyl)-2,3,4,9-tetrahydro-1H-β-carbolin-1-yl]cyclobutanecarboxylate hydrochloride 、 ethyl (1R)-1-[6-chloro-2-(1H-imidazol-5-ylcarbonyl)-2,3,4,9-tetrahydro-1H-β-carbolin-1-yl]cyclobutanecarboxylate hydrochloride