| http://www.w3.org/ns/prov#value | - A compound according to claim 1, wherein J is a 3 to 8-membered saturated or unsaturated alkylene chain optionally containing one to two heteroatoms independently selected from: ???O???, ???S??? or ???NR12???, wherein R12 is H, C1-C6 alkyl, such as methyl, or ???C(???O)C1-C6 alkyl, such as acetyl. 50.
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