prov:value
| - d from the group consisting of oxygen, nitrogen and sulfur; each occurrence of X5 is independently an organic functional group selected from the group comprising carboxylate (???C(???O)O???), cyano (???CN), hydroxyl (???OH), halo (Cl???, Br??? and I???), phenyl (???C6H5), and vinyl (???C(R5)???CH2), wherein R5 has the aforestated meaning; and each occurrence of m, n, o and p is an integer wherein
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