(S)-2-(Dimethoxymethyl)-1-pyrrolidinecarboxylic Acid 1,1-Dimethylethyl Ester is an intermediate in synthesizing Tilivalline (T440350), which is a metabolite from Klebsiella oxytoca. Tilivalline, is shown to be cytotoxin, and the key event causing Antibiotic-Associated Hemorrhagic Colitis.