1,1-diethyl-3-[4-(6-oxo-3-phenylpyridazin-1-yl)butyl]urea

1,1-diethyl-3-[5-(6-oxo-3-phenylpyridazin-1-yl)pentyl]urea

1,1-diethyl-3-[6-(6-oxo-3-phenylpyridazin-1-yl)hexyl]urea

N,N-diethyl-3,4,6,7,8,8a-hexahydro-1H-pyrrolo[1,2-a]pyrazine-2-carboxamide

N,N-diethyl-1,3,4,6,7,8,9,9a-octahydropyrido[1,2-a]pyrazine-2-carboxamide