n R5 is methyl and R6 is an alkyl group having from 1 to 4 carbon atoms; (iv) CH2???C(COOR7)CH2COOR8, wherein R7 and R8 are independently an alkyl group having from 1 to 4 carbon atoms; (v) CH3CH???CHCOOR9, wherein R9 is an alkyl group having from 1 to 4 carbon atoms; (vi) styrene; and (vii) R12CH???CHR13, wherein R12 and R13 are independently hydrogen or methyl. 47.