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- Cyclobutene-1,2-dione, 3,4-dihydroxy- Cyclobutenedione, dihydroxy- NSC125692 Quadratic acid Squaric acid WLN: L4VVTJ CQ DQ