| http://www.w3.org/ns/prov#value | - t a hydrogen atom, A represents group (iii) wherein n is 0 (zero), p is an integer of 1 to 3, and R16 and R17, which may be the same or different, represent C1-4 alkyl or may form a five- to seven-membered saturated heterocyclic ring optionally substituted by C1-4 alkyl or an oxygen atom together with the nitrogen atom, to which they are attached, and, more preferably, X represents CH or N and Z r
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