A problem to be solved by the present invention is to provide a crystal which is excellent in storage stability and non-hygroscopicity, and which can be obtained with good reproducibility. The present invention relates to a process for the preparation of 4-((1-methylpyrrol-2-yl)-carbonyl)-N-(4-(4-morpholin-1-yl-carbonylpiperidin--1-piperazinecarboxamide monohydrate.본 발명이 해결해야 할 과제는 보존 안정성 및 비흡습성이 양호하며, 특히 재현성 양호하게 취득 가능한 결정을 제공하는 것이다. 본 발명은, 4-((1-메틸피롤-2-일)-카르보닐)-N-(4-(4-모르폴린-1-일-카르보닐피페리딘-1-일)-페닐)-1-피페라진카르복사미드·1수화물의 결정을 제공한다.