... Mass spectrum: m/z (%): 262 (41); 192 (100); 164 (38); b the values of o(C=O) and o(C=N) chemical shifts can ... The separated solid was collected by suction, washed with water, and recrystallized from ethanol to give 0·74 g (80%) product, mp 129 ... Collection Czechoslovak Chem. ...