InChI=1S/C19H19NO7/c1-25-12-6-4-5-11(9-12)7-8-15(21)20-13-10-14(26-2)17(22)18(27-3)16(13)19(23)24/h4-10,22H,1-3H3,(H,20,21)(H,23,24)