prov:value
| - In the compound having the structure shown in FIG. 6E, R1 is methyl, R2, R5 and R6 are each hydrogen, one of Y1 and Y2 is ethyl, the other being hydrogen, R3 and Y3 taken together are propylene, R4 and Y4 taken together are propylene, X1 is carboxylate, and, one of X2 and X3 is a linking group, the other being hydrogen.
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