C4-C18 alkyl radical; wherein R7 is H or a C1-C18 alkyl radical, more preferably R7 is H or a C1-C6 alkyl radical, and R8 is H or a C1-C18 alkyl radical, more preferably R8 is H or a C1-C6 alkyl radical, and most preferably R8 is H or CH3; (F) Maleates such as wherein R9 and R10 are independently H, C1-C30 alkyl, aryl, cycloalkyl, or heterocyclic radicals; (G) Fumarates such as wherein R11 and R1