InChI=1S/C18H18O5/c1-9-5-13(19)10(2)18-11(9)3-4-15(23-18)12-6-16-17(7-14(12)20)22-8-21-16/h5-7,15,19-20H,3-4,8H2,1-2H3/t15-/m0/s1