CAS 2508-19-2 appears in our catalog under these names: 2,4,6-Trinitrobenzenesulfonic acid - 5% Aqueous solution, 2,4,6-Trinitrobenzenesulfonic acid, 1% DMF solution, Picrylsulfonic Acid (ca. 1% in N,N-Dimethylformamide) [for Detection of Primary Amines], 2,4,6-Trinitrobenzenesulfonic acid (1% in DMF), 95%. Offered by: Biosynth, TCI, Fluorochem. Available pack sizes: 5g, 2g, 10ml, 50ml, 10g, 25g, 50g.