the group consisting of halogen and --N3 ; --Z is selected from the group consisting of hydrogen, hydroxy, and methoxy; --R1 is an alkyl group having from about 6 to about 24 carbon atoms; --R is selected from the group consisting of hydrogen, hydroxy, alkyl esters of hydroxy having from about 1 to about 5 carbon atoms, alkyl having from about 1 to about 5 carbon atoms, and alkoxy having from abo