Synonym: (S)-Pyrrolidine-2-carboxylic acid- 13 C5, 15 N, L-Proline-ul- 13 C, 15 N, 13 C and 15 N Labeled L-proline Empirical Formula (Hill Notation): 13 C5H9 15 NO2 Molecular Weight: 121.09 MDL number: MFCD00144671 Packaging 100, 500 mg in glass bottle