CAS 2057-84-3 appears in our catalog under these names: Pentanal-2,4-dinitrophenylhydrazone, Valeraldehyde 2,4–Dinitrophenylhydrazone, Valeraldehyde 2,4-Dinitrophenylhydrazone, >98.0%(HPLC)(T), VALERALDEHYDE-DNPH, 1X1ML, 100UG/ML, &, N-VALERALDEHYDE 2,4-DINITROPHENYLHYDRAZONE, 98.0%, 98.0%. Offered by: Dr. Ehrenstorfer, GLPBio, TCI, Sigma-Aldrich, Chemat. Available pack sizes: 100mg, 10g, 1g, 5g, 1EA, 1x100mg, 1x10ml.