dichlorobenzene trichlorobenzene pentachlorobiphenyl 2,3',4,4',5'-Pentachlorobiphenyl CHEBI:81521 0 CAS:65510-44-3 KEGG:C18119 PCB 123 InChI=1S/C12H5Cl5/c13-7-1-2-8(9(14)5-7)6-3-10(15)12(17)11(16)4-6/h1-5H 326.43300 chebi_ontology 323.88339 Clc1ccc(c(Cl)c1)-c1cc(Cl)c(Cl)c(Cl)c1 YAHNWSSFXMVPOU-UHFFFAOYSA-N C12H5Cl5