... 1) Part III: Y. Sawa, T. Kato, A. Morimoto, T. Masuda, M. Hori, and H. Fujimura, Yakagaka Zasshi, 95, 261 (1975 ... 3 CH2 CH2C3H541) >50 Morphine 5.2 0. 47 Codeine 18.5 5.5 a) cyclopropylmethyl b) oxalate c) M. Hori, H. Fujimura, T. Masuda, and Y. Sawa, Yakugaku Zasshi ...