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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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20-[1-[6-(2,4-Dioxo-5-methyl-1,2,3,4-tetrahydropyrimidin-1-yl)hexyl]pyridinium-4-yl]-5,10,15-tris(1-methylpyridinium-4-yl)-21H,23H-porphyrin PubChem CID 136697308
Cc1cn(CCCCCC[n+]2ccc(C3=C4C=CC(=N4)C(=C4C=CN(C)C=C4)C4=NC(=C(c5cc[n+](C)cc5)c5ccc([nH]5)C(c5cc[n+](C)cc5)=C5C=CC3=N5)C=C4)cc2)c(=O)nc1O