Absorption and fluorescence emission spectra of 6-carboxyrhodamine 6G in pH 7.0 buffer.
C6127: 5-carboxyrhodamine 6G, succinimidyl ester (5-CR 6G, SE) *single isomer*
C6128: 6-carboxyrhodamine 6G, succinimidyl ester (6-CR 6G, SE) *single isomer*
C6157: 5-(and-6)-carboxyrhodamine 6G, succinimidyl ester (5(6)-CR 6G, SE) *mixed isomers*