1,2,7,9-TCDD

1,2,7,9-Tetrachlorodibenzodioxin

1,2,7,9-Tetrachlorodibenzo-p-dioxin

1,2,7,9-Tetrachlorodibenzo[1,4]dioxin

1,2,7,9-Tetrachlorodibenzo[b,e][1,4]dioxin