for the following products
(R)-N-Boc-(4-pyridyl)alanine (E.E.) | Boc-3-(4-pyridyl)-D-Ala-OH | Boc-D-3-(4-Pyridyl)-alanine | Boc-D-4Pal-OH | N-alpha-tert-Butyloxycarbonyl-3-(4-pyridine)-D-alanine | N-tert-Butoxycarbonyl-D-3-(4-pyridyl) alanine and Boc-D-4-Pyridylalanine
