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Caffeic acidCas#: 331-39-5 Compound CID: 689043Formula: C9H8O4 Molecular Weight: 180.16IUPAC Name: (E)-3-(3,4-dihydroxyphenyl)prop-2-enoic acidSMILES: C1=CC(=C(C=C1C=CC(=O)O)O)OInChIKey: QAIPRVGONGVQAS-DUXPYHPUSA-NInChI: InChI=1S/C9H8O4/c10-7-3-1-6(5-8(7)11)2-4-9(12)13/h1-5,10-11H,(H,12,13)/b4-2+Synonyms: (E)-3,4-dihydroxycinnamic acid | 3,4-Dihydroxycinnamic acid