InChI=1S/C21H31NO8/c1-2-14(29-21-18(26)16(24)17(25)19(30-21)20(27)28)10-6-3-4-7-11-15(23)22-12-8-5-9-13-22/h3-4,6,8,10,12,14,16-19,21,24-26H,2,5,7,9,11,13H2,1H3,(H,27,28)/b4-3-,10-6+