반응 완료 후 물 2500 ml를 이용해 석출시킨 후 여과 및 건조하여 상기 화학식 2-1로 표시되는 화합물을 얻었다.
After completion of the reaction, precipitation was performed with 2500 ml of water, filtered, and dried to obtain a compound represented by the formula 2-1.