Novel aromatic carboxylic amides of the general formula: ##STR1## wherein each of R1 and R2 is a hydrogen atom or an alkyl group having 1-4 carbon atoms, R3 and R4 are hydrogen atoms or together form another chemical bond, each X is a hydroxyl group, a halogen atom, an alkyl group having 1-4 carbon atoms and an alkoxy group containing 1-4 carbon atoms, and n is an integer of 1-3 with the proviso t