炔雌醇杂质对照品雌二醇衍生物杂质A17α-ethinylestra1,3,5(10),6-tetraene-3,17β-diol雌二醇衍生物杂质B2-Methoxy-17α-ethinylestra1,3,5(10)triene-3,17β-diol雌二醇衍生物杂质C6-oxo-17α-ethinylestra-1,3,5(10)triene-3,17-diol***雌二醇Ethinylestradiol57-63-6***雌二醇杂质AEthinylestradiolImpurityA***雌二醇杂质BEthinylestradiolImpurityB***雌二醇杂质IEthinylestradiolImpurityI)