| http://www.w3.org/ns/prov#value | - R1 is a linear or branched alkyl or a cycloalkyl radical, containing 6 to 22 carbon atoms, more particularly 6 to 16 carbon atoms and preferably 8 to 12 carbon atoms, optionally substituted with at least one hydroxyl group, with at least one linear or branched C1-C6 alkoxy or C1-C6 cycloalkoxy group, and/or with at least one cyano group; R2 and R3, independently of each other, represent a hydrogen
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