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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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1-(2,3,7,8,12,13,17,18-Octaethyl-21H,23H-porphyrin-10-yl)-3-(2,3,7,8,12,13,17,18-octaethyl-21H,23H-porphyrin-5-yl)urea PubChem CID 177428346
CCC1=C(CC)c2cc3[nH]c(c(CC)c3CC)c(NC(=O)Nc3c4nc(cc5[nH]c(cc6nc(cc7[nH]c3c(CC)c7CC)C(CC)=C6CC)c(CC)c5CC)C(CC)=C4CC)c3nc(cc4[nH]c(cc1n2)c(CC)c4CC)C(CC)=C3CC