polychlorinated dibenzodioxine 1,2,3,4,7,8-Hexachlorodibenzodioxin 1,2,3,4,7,8-HxCDD CAS:39227-28-6 Clc1cc2Oc3c(Cl)c(Cl)c(Cl)c(Cl)c3Oc2cc1Cl KEGG:C18100 0 InChI=1S/C12H2Cl6O2/c13-3-1-5-6(2-4(3)14)20-12-10(18)8(16)7(15)9(17)11(12)19-5/h1-2H 390.86100 C12H2Cl6O2 WCYYQNSQJHPVMG-UHFFFAOYSA-N 1,2,3,4,7,8-Hexachlorodibenzo-p-dioxin CHEBI:81502 387.81860 PCDD 66 chebi_ontology