tert-butyl 4-(6-aminopyridin-2-yl-3,4,5-d3)piperazine-1-carboxylate-2,2,3,3,5,5,6,6-d8 tert-butyl 4-(6-bromopyridin-2-yl)piperidine-1-carboxylate-2,2,3,3,4,5,5,6,6-d9 tert-butyl 4-(6-bromopyrazin-2-yl)piperidine-1-carboxylate-2,2,3,3,4,5,5,6,6-d9 tert-butyl 4-(6-bromopyridin-2-yl)-3-methylpiperidine-1-carboxylate tert-butyl 4-(6-aMinopyridin-3-yl)piperidine-1-carboxylate tert-butyl 4-(6-aminopyrimidin-4-yl)piperidine-1-carboxylate tert-butyl 4-(6-aminopyridin-3-yl-2,4,5-d3)piperazine-1-carboxylate-2,2,3,3,5,5,6,6-d8 tert-butyl 4-(6-bromopyrazin-2-yl-3,5-d2)piperidine-1-carboxylate tert-butyl 4-(6-bromopyrazin-2-yl)-3-methylpiperidine-1-carboxylate tert-butyl 4-(6-bromopyrazin-2-yl-3,5-d2)piperazine-1-carboxylate-2,2,3,3,5,5,6,6-d8 tert-butyl 4-(6-bromopyridazin-3-yl)-3-methylpiperidine-1-carboxylate tert-butyl 4-(6-bromopyrazin-2-yl-3,5-d2)piperidine-1-carboxylate-2,2,3,3,4,5,5,6,6-d9 tert-butyl 4-(6-bromopyrimidin-4-yl)-3-methylpiperidine-1-carboxylate