1,2-Benzenedicarboxaldehyde 4-07-00-02138 (Beilstein Handbook Reference) 643-79-8 BRN 0878317 EINECS 211-402-2 NSC 13394 PHTHALALDEHYDE Phtalaldehydes [French] Phthalic aldehyde Phthalic dialdehyde Phthalyldicarboxaldehyde o-Phthalaldehyde o-Phthaldialdehyde