yl, aryl(lower alkyl), thienyl, pyridinyl, thienyl(loweralkyl), and pyridinyl (loweralkyl); wherein said aryl as used in the definition of said Ar and of said Q is a member selected from the group consisting of phenyl substituted with from 1 to 2 substituents each independently selected from the group consisting of halo, lower alkyl, lower alkyloxy, trifluoromethyl and amino. 2.