| abstract |
A compound having the formula <IMAGE> wherein R is one or more moieties selected from the group consisting of hydrogen and alkyl having from 1 to 20 carbon atoms, R2 is an alkyl group having from 1 to 20 carbon atoms, R1 is an alkyl group having from 1 to 20 carbon atoms, m is an integer from 0 to 3, y is an integer from 1 to 3, x and z are each an integer from 0 to 2, n and p are each an integer from 1 to 20, with the proviso that m+yp=4n, the sum of x, y and z is 3. |