InChI=1S/C21H22O4/c1-11(2)4-6-15-19(23)12(3)8-16-17-10-24-18-9-13(22)5-7-14(18)20(17)25-21(15)16/h4-5,7-9,17,20,22-23H,6,10H2,1-3H3/t17-,20-/m0/s1