InChI=1S/C13H20O4/c1-3-4-5-12-13(16)10(8-17-12)6-7-11(15)9(2)14/h3-7,9-16H,1,8H2,2H3/b5-4+,7-6+/t9-,10+,11-,12+,13-/m1/s1