5,6,7,8-Tetrahydroimidazo[1,2-a]pyridine-2-carbaldehyde
(1S,9R)-tert-Butyl 9-(1,3-dioxoisoindolin-2-yl)-10-oxooctahydro-1H-pyridazino[1,2-a][1,2]diazepine-1-carboxylate
3-Bromo-6-hydrazinylpyridazine
tert-Butyl 2-oxo-5,6-dihydropyridine-1(2H)-carboxylate