InChI=1S/C18H18O5/c1-9-5-11-3-4-14(23-18(11)10(2)17(9)20)12-6-15-16(7-13(12)19)22-8-21-15/h5-7,14,19-20H,3-4,8H2,1-2H3/t14-/m0/s1