| http://www.w3.org/ns/prov#value | - an alkylene chain containing at least one hetero-atom of formula ???[CH(CH3)]p-(CH2)nl-X???(CH2)nh-; mh is the integer 5 or 6; nh and nl are an integer from 1 to 5; p is zero or 1 and X is O, S, ???N???CH3 or the ureido group ???NH???CO???NH???; R3h is hydrogen, straight or branched C1-C9 alkyl, C3-C6 cycloalkyl, benzyl, phenyl or p-methoxybenzyl;
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