Contraception guide NHS Choices: The combined pill
N-Hydroxysuccinimide (NHS) and n-(3-dimethylaminopropyl)-n′-ethylcarbodiimide hydrochloride (EDC·HCl) was purchased from Macklin Biochemical Co., Ltd. (Shanghai, China). Oleic acid and sodium periodate were purchased from Aladdin Biochemical Science and Technology Co., Ltd. (Shanghai, China)....