| http://www.w3.org/ns/prov#value | - ???(L)i???(S)j???R3 wherein L is a linking unit independently selected from the following: and mixtures thereof, wherein R??? is independently hydrogen, C1-C4 alkyl, and mixtures thereof; preferably hydrogen or alternatively R??? and S can form a heterocycle of 4 to 7 carbon atoms, optionally containing other hetero atoms and optionally substituted.
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