5-amino-2-imino-3,4-ethylenedithio-2H-pyrrole, 5-imino-2,3-dihydro-[1,4]dithiino[2,3-c]pyrrol-7-amine, 7-imino-2,3-dihydro-7H-[1,4]dithiino[2,3-c]pyrrol-5-ylamine, 1-amino-3-imino-4,7-dithia-4,5,6,7-tetrahydroindole, 2,3-dihydro-5-imino-5H-1,4-dithiino[2,3-c]pyrrol-7-amine, 1-Amino-3-imino-4,5,6,7-tetrahydro-4,7-dithiaisoindolenin