2,3-Dioxo-2,3-dihydrothionaphthene 2,3-Thionaphthenequinone 493-57-2 Benzo[b]thiophene-2,3-dione Glyoxylic acid, (o-mercaptophenyl)-, .gamma.-(thio lactone) NSC114478 Thianaphthenequinone Thioisatin Thionaphthenequinone Thionaphthoquinone