InChI=1S/C15H18O4/c1-7-4-5-9-8(2)13(16)18-11(9)12-14(3)10(19-14)6-15(7,12)17/h4,9-12,17H,2,5-6H2,1,3H3/t9-,10+,11-,12-,14+,15+/m0/s1