InChI=1S/C16H24O4/c17-15(18)13-11-9-7-5-3-1-2-4-6-8-10-12-14-16(19)20/h1,3,6,8,12,14H,2,4-5,7,9-11,13H2,(H,17,18)(H,19,20)/b3-1-,8-6-,14-12-