InChI=1S/C15H20O5/c1-8-10-4-3-9-7-15(2,6-5-11(9)20-18)13(16)12(10)19-14(8)17/h3,10-13,16,18H,1,4-7H2,2H3/b9-3+/t10-,11+,12-,13-,15?/m0/s1