InChI=1S/C16H18O6/c1-8-3-2-4-12-16(22-12)15(20)14-9(6-13(19)21-8)5-10(17)7-11(14)18/h5,7-8,12,16-18H,2-4,6H2,1H3/t8-,12+,16+/m0/s1