ATT 594 carboxylic acid is a red-fluorescent rhodamine dye with high quantum yield, outstanding thermal and photostability, and excellent water solubility, ideal for high-resolution microscopy and single-molecule detection. ATT 594 carboxylic acid serves as a non-reactive reference standard, yet its carboxylic group allows conjugation with hydrazines, hydroxylamines, and amines via carbodiimides like EDAC.
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