InChI=1S/C13H20O5/c14-11(13(17)18)9-7-5-3-1-2-4-6-8-10-12(15)16/h4,6,8,10-11,14H,1-3,5,7,9H2,(H,15,16)(H,17,18)/b6-4+,10-8+