InChI=1S/C18H22O4/c1-9(2)11-8-12-13-7-10-5-3-4-6-18(10,17(21)22-13)14(12)16(20)15(11)19/h8-10,13,19-20H,3-7H2,1-2H3/t10-,13+,18-/m1/s1