1,2-Dihydroxycyclobutene-3,4-dione 1,2-Diketo-3,4-dihydroxycyclobutene 2892-51-5 3,4-Dihydroxy-3-cyclobutene-1,2-dione 3,4-Dihydroxy-cyclobutene-1,2-dione 3-Cyclobutene-1,2-dione, 3,4-dihydroxy- 4-08-00-02701 (Beilstein Handbook Reference) 94592-78-6 AI3-61444 BRN 0774275 CCRIS 6793 CYCLOBUTENE-1,2-DIONE, 3,4-DIHYDROXY- Cyclobutenedione, dihydroxy- (8CI) Dihydroxycyclobutenedione EINECS 220-761-4 NSC 125692 Quadratic acid Squaric acid