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基于 PubChem CID 索引，支持名称 / 同义词 / CAS / SMILES 检索。
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(7a,17a)-17-Hydroxy-7-(methyl-13C,d3)-19-norpregn-5(10)-en-20-yn-3-one; 7a-(Methyl-13C,d3)-5,10-norethindrone PubChem CID 133587891
[2H][13C]([2H])([2H])[C@@H]1CC2=C(CCC(=O)C2)[C@H]2CC[C@@]3(C)[C@@H](CC[C@@]3(O)C#C)[C@@H]21 -
(7|A,17|A)-17-Hydroxy-7-(methyl-13C,d3)-19-norpregn-5(10)-en-20-yn-3-one PubChem CID 71752564
[2H][13C]([2H])([2H])[C@H]1CC2=C(CCC(=O)C2)[C@H]2CC[C@@]3(C)[C@@H](CC[C@@]3(O)C#C)[C@@H]21