prov:value
| - More preferably, R1 is a linear or branched alkyl group having from about 8 to about 18 carbon atoms, R2, R3, R4 and R5 are independently hydrogen, a linear or branched alkyl group having from 1 to about 6 carbon atoms, or ???(R7O)nR6, R6 is hydrogen or methyl, R7 in each of the n (R7O) groups is independently ethylene or propylene, n is an average number from 1 to about 5, and x and y are indepen
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