prov:value
| - In compound 3B-E, one of R1 and R2 is ethyl, the other being hydrogen, R3 and R9 taken together form a six membered ring, R4 and R8 taken together form a six membered ring, R5 is methyl, 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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