InChI=1S/C20H20O7/c21-9-10-6-13(12-5-4-11(22)8-17(12)25)18(20(26)27)14(7-10)19-15(23)2-1-3-16(19)24/h1-5,7-8,13-14,18,21-25H,6,9H2,(H,26,27)