| http://www.w3.org/ns/prov#value | - The compound according to claim 1, wherein R1 and R2 represent C1-4 alkoxy, R3 represents a group other than a hydrogen atom, R4, R5, and R6 represent a hydrogen atom, and A represents group (iv) wherein q is 0 (zero), r is 1 or 2, s is 1 or 2, t is 1 or 2, and R18 represents optionally substituted phenyl. 20.
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