. "adical having 1-10 carbon atoms, or R2 4 is a cycloalkyl radical having 5-7 carbon atoms or a cycloalkyl radical having 5-7 atoms comprising atoms and one or two nitrogen, oxygen or sulfur atoms as heteroatoms; Y is H, CH3, or CH2 CH3 ; and Z is a .[.halgen.]. .Iadd.halogen .Iaddend.CN, NO2, phenyl substituted in the o, o' or p positions with a halogen, CN or NO2 radical, phenylthio, phenylsulfoxy" . . .