3-Iodooxetane26272-85-530 % similar 3-Bromooxetane39267-79-330 % similar Erythritan4358-64-930 % similar 3-Azetidinol45347-82-830 % similar 3-Fluoroazethidine690257-76-230 % similar Oxetan-3-ol7748-36-930 % similar