1,4-dimethyl-3,6-bis(sulfanyl)piperazine-2,5-dione

S-(5-acetylsulfanyl-1,4-dimethyl-3,6-dioxopiperazin-2-yl) ethanethioate

7,9-dimethyl-3-(phenylhydrazinylidene)-2,4-dithia-7,9-diazabicyclo[3.2.2]nonane-6,8-dione

3-ethylimino-7,9-dimethyl-2,4-dithia-7,9-diazabicyclo[3.2.2]nonane-6,8-dione

3,6-二羟基-1,4-二甲基-2,5-哌嗪二酮