InChI=1S/C21H32O5/c1-13(12-22)5-4-6-14(2)15-9-10-21(3,26)17(15)11-16-18(23)7-8-19(24)20(16)25/h5,9,14,17,19,22,24-26H,4,6-8,10-12H2,1-3H3/b13-5+