prov:value
| - In the compound have the structure shown in FIG. 6C, R1, R2, R5, and R6 are each hydrogen, Y1 and Y2 are each methyl, 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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