THE FORMATION OF 2-PYRROLECARBOXYLIC ACID FROM HYDROXY-D- AND ALLOHYDROXY-D-PROLINE

Evidence is presented for the identity of chemically prepared 2-pyrrolecarboxylic acid and the metabolite formed in rat and human tissues from hydroxy-D-proline and allohydroxy-D-proline. 2-Pyrrolecarboxylic acid is not an intermediate in the biological degradation of natural hydroxyproline.