| http://www.w3.org/ns/prov#value | - moiety; are the same or different and independently represent a 5 or 6 membered heteroaryl ring which contains 1, 2, 3 or 4 heteroatoms in the ring which are independently N, S or O; and including N-oxides; X is a bond, or is one of the following groups: wherein Y is O, N???R6 or S; n??? is 0, 1 or 2; R6 is H, lower alkyl, aryl, ???C(O)R11 or ???C(O)???O???R11; R7 and R8 are the same or different
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