CAS 81-61-8 appears in our catalog under these names: 1,2,5,8-Tetrahydroxyanthracene-9,10-dione, Quinalizarin, 97.1%, 1,2,5,8-Tetrahydroxyanthracene-9,10-dione, 95%. Offered by: Chemat, MedChemExpress, Fluorochem. Available pack sizes: 5mg, 25mg, 5 mg.