HCID 7139374-OXO-4,5,6,7-TETRAHYDROBENZO[B]FURAN-3-카르복실산4-Oxo-4,5,6,7-tetrahydro-1-benzofuran-3-carboxylic acid · CAS 56671-28-4 · CID 713937 · C9H8O4