InChI=1S/C12H20O4/c1-2-5-9-8-11(14)10(13)6-3-4-7-12(15)16-9/h3,6,9-11,13-14H,2,4-5,7-8H2,1H3/b6-3-/t9-,10+,11-/m1/s1