. . . . . "As preferred examples of R1 --O-- occurring in formulas 3!, 4a!, 5a!, 5g!, etc., there may be mentioned residues of the following formulas: ##STR4## where R13 is a hydrogen or halogen atom or a lower alkyl or halo-lower alkyl group, R14 is a hydrogen or halogen atom or a cyano, carboxyl, lower alkoxycarbonyl, lower alkyl or halo-lower alkyl group, and R15 is a lower alkylene group; ##STR5## where" .