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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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(2S)-2-[[4-[(2,4-diaminopteridin-6-yl)methyl-methylamino]benzoyl]amino]-5-methoxy-5-oxopentanoic acid CAS 67022-39-3 PubChem CID 14537264
COC(=O)CCC(NC(=O)c1ccc(N(C)Cc2cnc3nc(N)nc(N)c3n2)cc1)C(=O)O -
L-Glutamic acid, N-[4-[[(2,4-diamino-6-pteridinyl)methyl]methylamino]benzoyl]-, 5-methyl ester; Methotrexate 5-Methyl Ester; Methotrexate Imp. H (EP); Methotrexate Related Compound H; Methotrexate Impurity H CAS 67022-39-3 PubChem CID 14537265
COC(=O)CC[C@H](NC(=O)c1ccc(N(C)Cc2cnc3nc(N)nc(N)c3n2)cc1)C(=O)O