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【单选题】
甾体强心苷类药物(洋地黄毒苷与地高辛)的：Kedde反应原理是( )A.
α-去氧糖与FeCl 3 的冰醋酸溶液显靛蓝色
B.
与胆甾醇结合为醇中不溶物
C.
与L-抗坏血酸、过氧化氢、盐酸作用产生荧光物质
D.
不饱和内酯侧链的反应
E.
C 17 上α-或β-γ不饱和内酯(丁烯内酯)于碱性介质中与芳香硝基化合物形成有色配位离子化合物
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