Tetrahydro-4-methylene-2H-pyran36838-71-8100 % similar Tetrahydro-4H-pyran-4-one29943-42-840 % similar 1,4-Dioxane123-91-133 % similar 12-Crown-4294-93-933 % similar 15-Crown-533100-27-533 % similar Ethylene oxide75-21-833 % similar 3-Oxotetrahydrofuran22929-52-830 % similar 2-Methylene-1,3-propanediol3513-81-330 % similar 2,5-Dimethyl-1,5-hexadiene627-58-730 % similar 3-Methylenepentane760-21-430 % similar