4,5-Desisopropylidene topiramate106881-41-8100 % similar Topiramate97240-79-464 % similar 2,3:4,5-Di-O-isopropylidene-β-D-fructopyranose20880-92-635 % similar Rel-(5R,6S)-6-amino-2,2-dimethyl-1,3-dioxepan-5-ol79944-37-933 % similar Diacetone L-sorbose17682-70-132 % similar 1,2:5,6-Di-O-isopropylidene-D-mannitol1707-77-331 % similar