| # | Metabolite | Functional group | Multiplicity | Shift | Number of protons |
|---|---|---|---|---|---|
| 51 | Propylene glycol | CH3 | doublet | 1.129 | 3 |
| 52 | Ser-PETA | CH2 | multiplet | 3.267 | 2 |
| 53 | Ser-PETA | CH | multiplet | 3.977 | 1 |
| 54 | Ser-PETA | CH2 | multiplet | 4.08 | 2 |
| 55 | Ser-PETA | CH | multiplet | 4.233 | 1 |
| 56 | Ser-PETA | CH | multiplet | 4.296 | 1 |
| 57 | Thr-PETA | CH3 | doublet | 1.453 | 3 |
| 58 | Thr-PETA | CH2 | triplet | 3.246 | 2 |
| 59 | Thr-PETA | CH | doublet | 3.741 | 1 |
| 60 | Thr-PETA | CH2 | doublet | 4.039 | 2 |