6 - ROX, SE 6 - Carboxy - X - rhodamine, succinimidyl ester; 6 - ROX, NHS ester
≥90% by HPLC
6-ROX, SE is the other purified single isomer of 5(6)-ROX, SE. It appears that 5-ROX is more often used than 6-ROX for labeling peptides and proteins. 6-ROX is predominately used for labeling nucleotides and sequencing nucleic acids.