2082771 HO-PCBs hydroxylated polychlorinated biphenyls 17 2082773 HO-PCBs hydroxylated PCBs 6 2082776 HO-PCBs hydroxylated metabolites of PCBs 2 2082777 HO-PCBs Hydroxylated metabolites of polychlorinated biphenyls 2 2082774 HO-PCBs hydroxylated PCB metabolites 2 2082778 HO-PCBs hydroxy-PCBs 1 2082775 HO-PCBs hydroxylated polychlorinated biphenyl metabolites 1 2082772 HO-PCBs para-hydroxylated PCBs 1