x1 = DFG
x2 = E1
x3 = E2
x4 = Cn
x5 = Gly
x6 = _3DG
x7 = FA
x8 = _1DG
x9 = AA
x10 = Man
x11 = Glu
x12 = MG
x13 = Mel
x14 = Fru