| http://www.w3.org/ns/prov#value | - n is an integer between 1 and 3, Z an ester group (???O???CO???) and R1 and R2 independently, represent a long-chain saturated or unsaturated alkyl group (from C7 to C19), R3 can be either a small alkyl group (C1 to C3) and X is either a halogen atom or a tosylate group,
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