InChI=1S/C19H19NO6/c1-20-12-5-3-2-4-10(12)18(24)16-13(23)7-14-11(17(16)20)6-15(26-14)19(25,8-21)9-22/h2-5,7,15,21-23,25H,6,8-9H2,1H3