左炔诺孕酮EP杂质U 货号:L005021 英文名:Levonorgestrel EP Impurity U 同义词:(8R,9S,10R,13S,14S,17R)-17-ethynyl-17-hydroxy-13-methyl-6,7,8,9,10,11,12,13,14,15,16,17-dodecahydro-1H-cyclopenta[a]phenanthren-3(2H)-one CAS号:68-22-4 分子式:C20H26O2 分子量:298.42 询价订购