InChI=1S/C21H22O5/c1-13(2)17(22)6-4-14(3)8-10-25-21-19-16(9-11-24-19)12-15-5-7-18(23)26-20(15)21/h5,7-9,11-12,17,22H,1,4,6,10H2,2-3H3/b14-8+