prov:value
| - wherein R1 and R1??? each, independently of the other, is an alkyl group, wherein at least one of R1 and R1??? has at least about 6 carbon atoms, R2 and R2??? each, independently of the other, is an alkylene group, wherein at least one of R2 and R2??? has at least about 3 carbon atoms, R3 is an alkylene group having at least about 2 carbon atoms, and R4 and R5 each, independently of the other, is
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