Synonyms: 5-Oxo-L-proline, compound with (4aS-cis)-2,3,4,4a,9,9a-hexahydro-2,4a,9-trimethyl-1,2-oxazino(6,5-b)indol-6-yl methylcarbamate (1:1);[(4aS,9aS)-2,4a,9-trimethyl-4,9a-dihydro-3H-oxazino[6,5-b]indol-6-yl] N-methylcarbamate; (2S)-5-oxopyrrolidine-2-carboxylic acid