InChI=1S/C21H26O5/c1-10(2)11-9-12-13(15(23)14(11)22)21-8-6-7-20(3,4)18(21)17(16(12)25-5)26-19(21)24/h9-10,16-18H,6-8H2,1-5H3/t16-,17?,18?,21-/m0/s1