. . . "R may be a substituted aryl or heterocyclic group, wherein the aryl or heterocyclic may be substituted with an amino, hydroxy, mercapto or substituted with an alkyl having for example from about 1 to about 24 carbons or from 1 to about 12 carbons, or substituted with an alkenyl having for example from about 2 to about 24 carbons or from about 2 to about 12 carbons." .