prov:value
| - The structure of DR110 is shown below as Formula II. A second particularly compound suitable for use with the present invention, referred to herein as DR6G, R1 and R4 are each methyl, R2, R3, R5, and R6 are hydrogen, one of Y1 and Y2 is ethyl, the other being hydrogen, one of Y3 and Y4 is ethyl, the other being hydrogen, X1 is carboxylate, and one of X2 and X3 is a linking group, the other being h
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