InChI=1S/C14H18O6/c1-7-8-6-11(2)12(3,18-8)13(7,16)20-14(11)9(17-4)5-10(15)19-14/h5,7-8,16H,6H2,1-4H3/t7-,8+,11+,12-,13-,14+/m1/s1