2,5-Dihydroxy-3,6-dimethyl-3,6-diphosphono-2,5-diphospha(V)-1,4-dioxane-2,5-dione

(2,5-dihydroxy-3,6-dimethyl-1,4,2,5-dioxadiphosphorinane-3,6-diyl)bisphosphonic acid P,P'-dioxide