amides obtained from condensation between 2-nitro-4-benzyloxy-5-methoxybenzoic acid chloride and proline or hydroxyproline were reduced catalytically to 2,3-dihydro-8-hydroxy-7-methoxy-1h-pyrrolo [ 2,1-c ] [ 1,4 ] benzodiazepine-5,11 ( 10h , 11ah ) -dione and its 2-hydroxyderivative respectively .
C0033382
proline
C0020388
hydroxyproline