InChI=1S/C20H23NO7/c22-11-15-16(23)17(24)18(25)20(28-15)27-14-8-4-7-13(9-14)19(26)21-10-12-5-2-1-3-6-12/h1-9,15-18,20,22-25H,10-11H2,(H,21,26)/t15-,16+,17+,18-,20+/m1/s1