InChI=1S/C19H24O8/c1-3-13(10-8-6-4-5-7-9-11-15(21)25-2)26-19-18(24)17(23)16(22)14(12-20)27-19/h3,7,9,13-14,16-20,22-24H,1,5,11-12H2,2H3/b9-7-