1,7-(Dioxa)-2,6-diaza-4,7a-dithia-3H,5H-benzo(cd)pentalene-4-oxide 5H,7H-2,3-Dioxa-2alambda4,6-dithia-1,4-diazacyclopent(cd)indene, 6-oxide 85579-26-6 Hep-III