InChI=1S/C21H30O6/c1-19(2)10-9-16(22)21(19,4)15-7-5-14(6-8-15)18(25)27-12-11-20(3,26)13-17(23)24/h5-8,16,22,26H,9-13H2,1-4H3,(H,23,24)/t16-,20-,21+/m1/s1