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Structures of NDL-PCBs and their respective hydroxylated derivatives. PCB91 (2,2′,3,4′,6-pentachlorobiphenyl); PCB95 (2,2′,3,5′,6-pentachlorobiphenyl); PCB132 (2,2′,3,3′,4,6′-hexachlorobiphenyl); PCB149 (2,2′,3,4′,5′,6-hexachlorobiphenyl). 4-OH-PCB149 was not available for testing. Abbreviation: NDL-PCBs, non–dioxin like polychlorinated biphenyls.
