The first substratelike, reversible inhibitors of different copper amine oxidases (CAOs) with IC50 (M) as low as 2.0× 10-8 corresponding to derivatives of 4-aminomethylpyridine with alkoxy (1a-d), alkylthio (2a, b), and alkylamino (3a-e, 4a-j) groups in the positions 3 and 5