... and F. Kalfei*(2) 'Laboratory of Chemical Pharmacology "Podravka ... (1) Present Address: Department of Chemistry, A1 Najah National (2) Address for correspondencr. (3) N. BlaieviC and F. Kajfei, J. Heterocyclir Chem., 7, 1173 (1970). (4) N. BlaieviC and F. Kajfe?, ibid.. ...