6-(benzhydrylidene-amino)-4-methyl-3,4,9,9a-tetrahydro-1H-2,4a,5-triaza-fluorene-2-carboxylic acid tert-butyl ester
(4R,9aR)-6-benzyloxy-4-methyl-3,4,9,9a-tetrahydro-1H-2,4a,5-triaza-fluorene-2-carboxylic acid tert-butyl ester
6-Bromo-1H-pyrrolo [2,3-b]pyridine-2-carboxylic acid ethyl ester
6-chloro-1H-pyrrolo[2,3-b]pyridine-2-carboxylic acid ethyl ester