. . " 1 to 2 ring substitutents selected from the group consisting of halogen, alkoxy having 1 to 6 carbon atoms, alkyl having 1 to 6 carbon atoms, and alkenyl having 3 to 6 carbon atoms, R2 is hydrogen or methyl, and R3 is hydrogen, methyl, halogen including chlorine, bromine, iodine, and fluorine, nitro, or acetamido." . . .