InChI=1S/C17H16O5/c1-19-15-6-11-13(7-16(15)20-2)21-8-12-10-4-3-9(18)5-14(10)22-17(11)12/h3-7,12,17-18H,8H2,1-2H3/t12-,17-/m0/s1