4-Ethylamino-6-methyl-7,7-dioxo-4,5,6,7-tetrahydro-7lambda*6*-thieno[2,3-b]thiopyran-2-sulfonic acid amide
4-ethylamino-6-methyl-7,7-dioxo-4,5,6,7-tetrahydro-7lambda6-thieno[2,3-b]thiopyran-2-sulfonic acid amide