6-ROX Pro Phosphoramidite is a reagent used in the automated synthesis of fluorescently labeled oligonucleotides. It features the 6-carboxy-X-rhodamine (6-ROX) fluorophore, known for its strong red-orange emission (~600 nm), making it ideal for multiplexed assays where spectral separation is crucial. The Pro linker enables both 5′-end and internal modifications.