. . "ogen or a hydrocarbon radical free of aliphatic unsaturation containing from 1 to 8 carbon atoms;X is --CH= or --N= and is in a position ortho, meta, or para relative to the ##STR2## group; each of Y and Z is hydrogen or a noninterfering substituent such as halogen (chlorine, bromine, fluorine, iodine), nitro, cyano, amino (--NH.sub.2),lower alkylamino, lower alkyl, lower alkyloxy, lower acyloxy," . .