5H-1,2,4-Triazino[5,6-b]indole-5-acetic acid, 2,3-dihydro-3-thioxo-
2,3-Dihydro-3-thioxo-5H-1,2,4-triazino[5,6-b]indole-5-acetic acid
(2-Mercapto-1,3,4,9-tetraaza-fluoren-9-yl)-acetic acid
2-(3-Sulfanylidene-2H-[1,2,4]triazino[5,6-b]indol-5-yl)acetic acid