Table 1

GC-MS retention times (tR) of the PFB or di-PFB derivatives of the amino acid conjugates of VPA

PFB or di-PFB*derivatives of:GC-MS (tR = min)
VPA GLN15.30
VPA GLU* 16.58
VPA GLY8.99
VPA ASP* 15.71
FVPA GLN14.77