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