1,3,3a,4,9,9a-Hexahydrothieno(3,4-b)quinoxaline 2,2-dioxide 56714-11-5 Hexahydro-1,3,3a,4,9,9a thieno(3,4-b)quinoxaline dioxyde-2,2 [French] Thieno(3,4-b)quinoxaline, 1,3,3a,4,9,9a-hexahydro-, 2,2-dioxide