InChI=1S/C13H20O6/c1-2-3-4-5-13(16)9-11(15)17-7-12(9)10(19-13)8(14)6-18-12/h8-10,14,16H,2-7H2,1H3/t8-,9+,10+,12+,13-/m1/s1