4-[(2-methyl-5,7-dioxo-2,3,5,7-tetrahydro-[1,4]dithiino[2,3-c]pyrrol-6-ylmethyl)-amino]-benzenesulfonic acid
6-(4-bromo-benzenesulfonyl)-2-methyl-2,3-dihydro-[1,4]dithiino[2,3-c]pyrrole-5,7-dione
2-methyl-6-[N'-(4-nitro-phenyl)-hydrazinomethyl]-2,3-dihydro-[1,4]dithiino[2,3-c]pyrrole-5,7-dione
2-methyl-6-(N'-phenyl-hydrazinomethyl)-2,3-dihydro-[1,4]dithiino[2,3-c]pyrrole-5,7-dione
6-anilinomethyl-2-methyl-2,3-dihydro-[1,4]dithiino[2,3-c]pyrrole-5,7-dione