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Certified Reference Standards...
化学名称: 3-Oxo-17α-pregn-4-ene-7α,9:21,17-dicarbolactone
微笑: O=C1C=C(C[C@]23[H])[C@@](CC1)(C)[C@]4(OC3=O)[C@]2([H])[C@@](CC[C@@]5(O6)CCC6=O)([H])[C@]5(C)CC4
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