.beta.,.beta.'-Methylenedithiodialanine 3,3'-Methylenedithiobis(2-aminopropanoic acid) 498-59-9 Alanine, 3,3'-(methylenedithio)di- Alanine, 3,3'-(methylenedithio)di-, L- DJENKOLIC ACID Djenkolate L-Cysteine thioacetal of formaldehyde L-Cysteine, S,S'-methylenebis- L-Djenkolate L-Djenkolic acid NSC76076