1,2,3,6,9-PCDD

1,2,3,6,9-pentachlorooxanthrene

1,4,6,7,8-Pentachlorodibenzo-p-dioxin

1,2,3,6,9-Pentachlorodibenzo[1,4]dioxin

1,2,3,6,9-Pentachlorodibenzo[b,e][1,4]dioxin