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ATTO 590 - Structure

R =
free acid (ATTO 590-2)	NHS-ester (ATTO 590-3)
maleimide (ATTO 590-4)	biotin derivative (ATTO 590-7)

ATTO 590 is available as a mixture of isomers (2,4-dicarboxyphenyl
and 2,5-dicarboxyphenyl) as well as the pure isomers.