The acyl portion of the acylated basic radical has the general formula: ##STR45## where R is C1 -C8 alkyl, C2 -C8 alkenyl, aryl, C7 -C12 substituted aryl, and C7 -C12 arylalkyl; and X is a bond, C, O, S, or N. Preferably R is C1 -C4 alkyl and X is oxygen.