左炔诺孕酮EP杂质B 货号:L005002 英文名:Levonorgestrel EP Impurity B 同义词:(8R,9S,13S,14S,17R)-13-ethyl-17-ethynyl-17-hydroxy-4,6,7,8,9,11,12,13,14,15,16,17-dodecahydro-1H-cyclopenta[a]phenanthren-3(2H)-one CAS号:19914-67-1 分子式:C21H28O2 分子量:312.45 询价订购