atoms alkynoyloxy of 3 8 carbon atoms carbamoyl n alkylcarbamoyl of 2 7 carbon atoms n n dialkylcarbamoyl of 3 13 carbon atoms and benzoylamino or ar is the radical a u2032 is a pyridinyl pyrimidinyl or phenyl ring wherein the pyridinyl pyrimidinyl or phenyl ring may be optionally mono or di substituted with substituent s independently selected from the group consisting of alkyl of 1 6 carbon atoms alkenyl of 2 6 carbon atoms alkynyl of 2 6 carbon atoms azido hydroxyalkyl of 1 6 carbon atoms halogen halomethyl alkoxymethyl of 2 7 carbon atoms alkanoyloxymethyl of 2 7 carbon atoms alkoxy of 1 6 carbon atoms alkylthio of 1 6 carbon atoms hydroxy trifluoromethyl cyano nitro carboxy alkoxycarbonyl of 2 7 carbon atoms alkanoyl of 2 7 carbon atoms phenoxy phenyl thiophenoxy benzoyl benzyl amino alkylamino of 1 6 carbon atoms dialkylamino of 2 to 12 carbon atoms phenylamino benzylamino alkanoylamino of 1 6 carbon atoms alkenoylamino of 3 8 carbon atoms alkynoylamino of 3 8 carbon atoms carboxyalkyl of 2 7 carbon atoms carboalkoxyalkyl of 3 8 carbon atoms aminoalkyl of 1 5 carbon atoms n alkylaminoalkyl of 2 9 carbon atoms n n dialkylaminoalkyl of 3 10 carbon atoms n alkylaminoalkoxy of 3 9 carbon atoms n n dialkylaminoalkoxy of 4 10 carbon atoms mercapto methylmercapto alkanoyloxy of 1 6 carbon atoms alkenoyloxy of 3 8 carbon atoms alkynoyloxy of 3 8 carbon atoms carbamoyl n alkylcarbamoyl of 2 7 carbon atoms n n dialkylcarbamoyl of 3 13 carbon atoms and benzoylamino t is substituted on a u2032 at carbon and is u2014 nh ch 2 m.