InChI=1S/C15H18O4/c1-8-4-5-12(16)15(18)7-11-10(6-14(8,15)3)9(2)13(17)19-11/h4-5,7-8,12,16,18H,6H2,1-3H3/t8-,12-,14+,15-/m0/s1