(S)-2-甲基吡咯烷-2-甲酰胺

H-DL-(αMe)Pro-NH2

dimethyl (S)-2-methylpyrrolidine-1,2-dicarboxylate

(2R,5S)-2-tert-butyl-5-methyl-1-aza-3-oxabicyclo(3.3.0)octan-4-one

5-methyl-1-oxido-3,4-dihydro-2H-pyrrol-1-ium