CAS 670269-33-7 appears in our catalog under these names: ATTO 590 NHS ESTER SUITABLE FOR FLUORES, ATTO 590 NHS ESTER, 6-[2-Carboxy[[(2,5-dioxo-1-pyrrolidinyl)oxy]carbonyl]phenyl]-1,11-diethyl-1,2,10,11-tetrahydro-2,2,4,8,10,10-hexamethylpyrano[3,2-g:5,6-g′]diquinolin-13-ium perchlorate. Offered by: Sigma-Aldrich, Chemat, MedChemExpress. Available pack sizes: 1MG, 5MG, 1 mg.