CAS 1157-84-2 appears in our catalog under these names: Benzaldehyd-2,4-dinitrophenylhydrazone, Benzaldehyde–2,4–dinitrophenylhydrazone environmental standard, 99%, Benzaldehyde 2,4-Dinitrophenylhydrazone, >98.0%(T), BENZALDEHYDE-DNPH, 1X1ML, 100UG/ML, &, Benzaldehyde-2,4-dinitrophenylhydrazone, 98%, 98%. Offered by: Dr. Ehrenstorfer, GLPBio, TCI, Sigma-Aldrich, Chemat. Available pack sizes: 100mg, 1g, 10g, 1EA, 250mg, 500mg, 1x100mg, 1x5ml.