x1 = ATP
x2 = ADP
x3 = AMP
x4 = GLC
x5 = F6P
x6 = FBP
x7 = GAP
x8 = NAD
x9 = NADH
x10 = DPG
x11 = PEP
x12 = PYR
x13 = ACA
x14 = EtOH
x15 = P