InChI=1S/C13H20O5/c14-11(10-13(17)18)8-6-4-2-1-3-5-7-9-12(15)16/h3,5,7,9,11,14H,1-2,4,6,8,10H2,(H,15,16)(H,17,18)/b5-3+,9-7+