xygen atom, m or n of (CH2)m or --(CH2)n to which R3 bonds is not 0; R4 is a hydrogen atom, an alkyl group having 1 to 8 carbon atoms, an alkoxy group having 1 to 8 carbon atoms, a halogen atom, a trifluoromethyl group, a cyano group, an amidino group, a carboxyl group or --COR7 wherein R7 is an alkylamino group having 1 to 8 carbon atoms which is optionally substituted by a substituted amino grou