1963 年 83 巻 4 号 p. 418-419
Further detailed examinations were made on isosinomenine, m. p. 210-212°, reported as one of the alkaloids contained in Sinomenium acutum REND. et WILS. Its molecular formula was found to be C20H25O4N and it had an ethoxyl group. This substance must have a structure of 3-methoxy-4-hydroxy-6-oxo-7-ethoxy-N-methyl-Δ5-morphinan (I) or 3-methoxy-4-hydroxy-6-ethoxy-7-oxo-N-methyl-Δ5-morphinan (II), and the name isosinomenine should be abolished.