1. Key Laboratory for Major Obstetric Diseases of Guangdong Province
2. The Third Affiliated Hospital of Guangzhou Medical University
3. Guangzhou 510150
4. People's Republic of China
5. Department of Chemistry
6. School of Pharmaceutical Sciences
7. Guangzhou Medical University
8. Guangzhou 511436
9. College of Chemistry and Molecular Sciences
10. Wuhan University
11. Wuhan 430072