공랭 후, 물과 CH2Cl2로 추출하여 유기층을 분리하고 MgSO4로 건조한 후, 용매를 감압유거했다.
After air cooling, extraction was performed with water and CH2Cl2, the organic layer was separated, dried with MgSO4, and the solvent was distilled off under reduced pressure.