prov:value
| - In compound 3B-D, R1 and R2 taken separately are hydrogen, R3 and R9 taken together form a six membered ring, R4 and R8 taken together form a six membered ring, R5, R6, R7, and R10 taken separately are hydrogen, X1 is carboxylate, and one of X3 and X4 is a linking group, the other being hydrogen.
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