InChI=1S/C16H20O6/c1-7-9(3)21-12-6-16(19,15(18)20-4)22-11-5-10(17)8(2)13(7)14(11)12/h5,7,9,12,17,19H,6H2,1-4H3/t7-,9-,12-,16-/m1/s1