1H-Pyrrole-2-carboxylic acid, 2,5-dihydro- (9CI) 2,5-Dihydro-1H-pyrrole-carboxylic acid 3,4-Dehydroproline 3-Pyrroline-2-carboxylic acid 3-Pyrroline-2-carboxylic acid (8CI) 3220-74-4 Dehydroproline NSC 49883 Proline, 3,4-didehydro-