InChI=1S/C16H22O5/c1-9(14(19)6-10(2)18)5-13-12(8-17)7-15(20)11(3)16(13)21-4/h6-7,9,17,19-20H,5,8H2,1-4H3/b14-6-/t9-/m1/s1