InChI=1S/C13H20O5/c14-11(8-6-10-13(17)18)7-4-2-1-3-5-9-12(15)16/h1,3,5,9,11,14H,2,4,6-8,10H2,(H,15,16)(H,17,18)/b3-1+,9-5+