1-Hydroxycyclobut-1-ene-3,4-dione potassium salt 3-CYCLOBUTENE-1,2-DIONE, 3-HYDROXY-, POTASSIUM SALT, HYDRATE 3-Cyclobutene-1,2-dione, 3-hydroxy-, potassium salt 31876-38-7 52591-22-7 Moniliformin Semisquaric acid potassium salt