CAS 56766-03-1 appears in our catalog under these names: 2,5–Diethoxyterephthalaldehyde, 1,4-Benzenedicarboxaldehyde, 2,5-diethoxy- 98%, 2,5-Diethoxyterephthalaldehyde, 97%, 97%, 2,5-Diethoxyterephthalaldehyde, 97%. Offered by: GLPBio, Ambeed, Chemat, Fluorochem. Available pack sizes: 100mg, 1g, 250mg, 5g.