1,4-Oxathiane15980-15-1100 % similar 1,4-Dioxane123-91-142 % similar 12-Crown-4294-93-942 % similar 15-Crown-533100-27-542 % similar Ethylene oxide75-21-842 % similar Tetrahydrofuran109-99-936 % similar Tetrahydrothiophene110-01-036 % similar Thietane287-27-436 % similar Oxetane503-30-036 % similar Thiane1613-51-033 % similar Dtdm103-34-432 % similar