for the following products
(S)-N-Boc-(4-Pyridyl)alanine | Boc-3-(4-pyridyl)-Ala-OH | Boc-4-Pal-OH | Boc-L-3-(4-pyridyl)-alanine | Boc-L-4-Pyridylalanine | Boc-L-4Pal-OH | N-alpha-tert-Butyloxycarbonyl-3-(4-pyridine)-L-alanine and Boc-Ala(4'-pyridyl)-OH
