InChI=1S/C17H20O6/c1-8(18)5-6-12-9(2)17(21)23-16(12)15-10(3)14(7-13(15)20)22-11(4)19/h12,14,16H,2,5-7H2,1,3-4H3/t12-,14+,16-/m0/s1