The present invention is pharmaceutically useful novel crystals of 9-ethyl-6,6-dimethyl-8- (4-morpholin-4-yl-piperidin-l-yl) oxo-11-dihydro -6,11- -5H- benzo [b] relates to the type II-carbazole-3-carbonitrile and III-form crystal.본 발명은 제약상 유용한 신규 결정인 9-에틸-6,6-디메틸-8-(4-모르폴린-4-일-피페리딘-1-일)-11-옥소-6,11-디히드로-5H-벤조[b]카르바졸-3-카르보니트릴의 II형 및 III형 결정에 관한 것이다.