prov:value
| - In a second particularly preferred acceptor dye that may be used in the present invention, referred to herein as DR6G-2, one of R1 and R2 is ethyl, the other being hydrogen, one of R3 and R4 is ethyl, the other being hydrogen, R5 and R8 taken separately are methyl, R6, R7, R9, and R10 are hydrogen, X1 is carboxylate, and one of X3 and X4 is a linking group, the other being hydrogen.
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