... pyrimido[5,4-ò]indole 18, thus offering access to a little- described heterocyclic system of ... Microanalyses and spectra were obtained by the Analytical Chemistry staff of Warner-Lambert Company under the ... t, 3H, J = 7.0 Hz, СН2СЯ3), 3.76 (s, 3H, NCH3), 4.28 (q, 2H, J = 7.0 Hz ...