Kozaburo Nishiyama? Makoto Oba, Ryuichi Ueno,? Ayako Morita,? Yoshikuni Nakamura,? and Masatsune Kainosho,? ... Department of Material Science and Technology, Tokai University, 317, Nishino, Numazu, Shizuoka 410-03, Japan, ?Department of Chemistry, Tokyo Metropolitan University, 1-1, Minamiohsawa, Hachioji, Tokyo 192-03, Japan ... Summary: Phenylalanines regiospecifically labelled with deuterium in the aromatic ring can be prepared through the ...