色爽视频-色思思-色四播播-色四虎-国产自产一c区-国产自精品 ,亚洲熟妇无码一区二区三区导航,国产亚洲精品久久久美女,亚洲av无码无在线观看红杏

5-[Bis(2-ethoxy-2-oxoethyl)amino]-4-cyano-2-(ethoxycarbonyl)-3-thiopheneacetic acid ethyl ester

Quality standard:
Appearance: White to pale yellow crystalline powder Mp : 106-107^oC
Assay≥99.0 % , Total impurity < 0.5 % , Individual impurity < 0.2 %