InChI=1S/C16H22O4/c1-8-6-10(19-9(2)17)12-13-11(8)14(18)20-16(13,5)7-15(12,3)4/h8,10,12H,6-7H2,1-5H3/t8-,10+,12-,16-/m1/s1