... The structures were confirmed by ir and nmr spectroscopy. J. Heterocyclic Chem., 20, 1181 (1983). ... (g) H-5. (h) H-6. (i) H-2. (j) о CH3: 2.32 s (2Н). (к) v С=0 (urethane) bands. ... [8] G. Stájer, AE Szabó. F. Fülöp, G. Bernáth and P. Sohár, Heterocycles, 19, 1191 (1982). ...