2,2'-dimethyl-2,2'-(2-methyl-2-aza-propanediyl)-di-malonic acid

三甲基硫脲

(3-methyl-4-oxo-2-thioxo-thiazolidin-5-ylidene)-acetic acid methyl ester

potassium methylcarbamothioate

2-(methylamino)-1-pyrroline