| http://www.w3.org/ns/prov#value | - Z2 taken together with the carbon atoms to which it is attached is a partially or fully unsaturated 5-6 membered monocyclic ring formed of carbon atoms optionally including 1-3 heteroatoms selected from O, N, or S, provided that (a) no more than two of Y1, Y2 and Y3 is O or S and (b) when o is 0, then each of Y1 and Y2 is CR12R12; and
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