InChI=1S/C15H21NO7/c1-6(3-10-13(19)7(2)15(22)23-10)9-5-16-12(14(20)21)8(9)4-11(17)18/h3,7-10,12-13,16,19H,4-5H2,1-2H3,(H,17,18)(H,20,21)/b6-3-