InChI=1S/C21H31NO8/c1-2-3-4-5-6-8-11-14(19(26)22-12-9-7-10-13-22)29-21-17(25)15(23)16(24)18(30-21)20(27)28/h4-6,8-9,12,14-18,21,23-25H,2-3,7,10-11,13H2,1H3,(H,27,28)/b5-4+,8-6-