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isa:222056023
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Preferably, B' is represented by graphic formula III or IV, wherein X is oxygen; Y is carbon or oxygen; R4 and R5 are each hydrogen or C1 -C4 alkyl; each R3 is a C1 -C4 alkyl, C1 -C4 alkoxy, hydroxy, or fluoro; and c is the integer 0, 1, or 2.
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n4:com
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