InChI=1S/C15H18O5/c1-7-3-4-11-15(20-11)6-10(19-14(15)17)12-8(2)13(16)18-9(12)5-7/h5,9-12,14,17H,2-4,6H2,1H3/b7-5-/t9-,10+,11-,12-,14+,15+/m1/s1