| http://www.w3.org/ns/prov#value | - Preferably, R1, R2, R3, R4, R5 and R6, independently of one another, are selected from the group consisting of H, C1???C8 alkyl, alkenyl, aryl, and alkyl optionally substituted by one or more of an alcohol, an amide, an ether, a polyether, a polyamide, an ester, a mercaptan, a urea, a thiourea, a guanidyl, or a carbamoyl group, and at least one of R1, R3, R4 and R6 is a straight chain or branched,
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