... I MACHIKO ONO, HINAKO TANAKA, KAZUHIDE HAYAKAWA, and SHINZO TAMURA* School of ... 31 (1983) TABLE I. 1H-NMR Chemical Shifts of the Amidine Methyl Signals of IV, V and IX (5 in CDC13) abcd IV 1.92 1.92 1.95 1.90 V 2.08 2.07 2.08 2.10 IX 1.63 1.60 1.62 ...