InChI=1S/C15H22O4/c16-14(17)12-10-8-6-4-2-1-3-5-7-9-11-13-15(18)19/h2,4-5,7,10,12H,1,3,6,8-9,11,13H2,(H,16,17)(H,18,19)/b4-2+,7-5+,12-10+