prov:value
| - Z is preferably a group of the formula ???Y2-L-Y3, wherein Y2 represents a single bond, ???C(O)???, ???C(O)NR17??? or ???C(O)O???, Y3 represents a single bond, ???C(O)???, ???C(O)NR17???, ???NR17???C(O)???, ???C(O)O???, ???O???C(O)???, ???NR17??? or ???O???, L is a bridging group which is preferably a substituted or unsubstituted aliphatic group or a substituted or unsubstituted aromatic group, ty
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