prov:value
| - In some especially preferred embodiments, R1, R4, R6, and R7 are each H, Y is ???O, n is 1, A1 A2 and B1 B2 are ???O or H,H, R2 is H, OH or lower alkyl, R3 is H or substituted alkyl, R5 and R8 are each H or alkoxy, with methoxy being preferred, Z is a bond or O, and m is 1 or 2.
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