dichlorobenzene tetrachlorobenzene hexachlorobiphenyl 2,3,3',4,4',5-Hexachlorobiphenyl 357.84442 InChI=1S/C12H4Cl6/c13-7-2-1-5(3-8(7)14)6-4-9(15)11(17)12(18)10(6)16/h1-4H 360.87800 chebi_ontology CAS:38380-08-4 PCB 156 CHEBI:81522 Clc1ccc(cc1Cl)-c1cc(Cl)c(Cl)c(Cl)c1Cl LCXMEXLGMKFLQO-UHFFFAOYSA-N C12H4Cl6 KEGG:C18120 0