prov:value
| - 22, wherein one and only one of R1, R2, R3, R4 and R5 is selected from the group of: a sulfonic acid group or a sulfonate group, wherein one or two of R1, R2, R3, R4 and R5 is a substituent group that is selected from the group consisting of: methyl and ethyl, and wherein B is selected from the group consisting of: hydrogen, methyl, or ethyl and wherein B is attached to any single carbon atom alon
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