InChI=1S/C17H22O4/c1-11(2)6-5-7-12(3)8-9-13-10-14(18)17(21-4)16(20)15(13)19/h6,10,14,16-18,20H,3,5,7H2,1-2,4H3/t14-,16-,17-/m1/s1