“…N-methylasimilobine (IVJ colourless crystals from diethylether m.p. 195-196° [13]; UV X I?S' 231, 272, 314 nm [13]; MS, m/e (%), 281 (M4, 90), 280 (100), 266(67), 250(96), 128 (53), 223(60) [13]; TLC Rf values and colour reactions identical with reference alkaloid (Table I) [17]; 60 MHz 'H NMR spectrum obtained from CDCI3 solution same as thebaine minus -OCH3: 11 6.6(2H, q, J = 8Hz, C-I and C-2H), 5.6 and 5.9 (2H, d, J = 5Hz, C-7 and C-8H), 5.3 (IH, s, C-5H), 3.59 (3H, s, OMe), 2.47 (3H, s, NMe); TLC R, values and colour reactions identical with reference alkaloid (Table I).…”