| Allowed Value | Details | 
|---|---|
| D-beta-peptide, C-gamma linking | Iso-peptide linking D-beta peptide | 
| D-gamma-peptide, C-delta linking | Iso-peptide linking D-gamma peptide | 
| D-peptide COOH carboxy terminus | |
| D-peptide NH3 amino terminus | |
| D-peptide linking | |
| D-saccharide | |
| D-saccharide 1,4 and 1,4 linking | |
| D-saccharide 1,4 and 1,6 linking | |
| DNA OH 3 prime terminus | |
| DNA OH 5 prime terminus | |
| DNA linking | |
| L-DNA linking | |
| L-RNA linking | |
| L-beta-peptide, C-gamma linking | Iso-peptide linking L-beta peptide | 
| L-gamma-peptide, C-delta linking | Iso-peptide linking L-gamma peptide | 
| L-peptide COOH carboxy terminus | |
| L-peptide NH3 amino terminus | |
| L-peptide linking | |
| L-saccharide | |
| L-saccharide 1,4 and 1,4 linking | |
| L-saccharide 1,4 and 1,6 linking | |
| RNA OH 3 prime terminus | |
| RNA OH 5 prime terminus | |
| RNA linking | |
| non-polymer | |
| other | |
| peptide linking | |
| peptide-like | |
| saccharide | 
| Allowed Value | Details | 
|---|---|
| D-beta-peptide, C-gamma linking | Iso-peptide linking D-beta peptide | 
| D-gamma-peptide, C-delta linking | Iso-peptide linking D-gamma peptide | 
| D-peptide COOH carboxy terminus | |
| D-peptide NH3 amino terminus | |
| D-peptide linking | |
| D-saccharide | |
| D-saccharide 1,4 and 1,4 linking | |
| D-saccharide 1,4 and 1,6 linking | |
| DNA OH 3 prime terminus | |
| DNA OH 5 prime terminus | |
| DNA linking | |
| L-DNA linking | |
| L-RNA linking | |
| L-beta-peptide, C-gamma linking | Iso-peptide linking L-beta peptide | 
| L-gamma-peptide, C-delta linking | Iso-peptide linking L-gamma peptide | 
| L-peptide COOH carboxy terminus | |
| L-peptide NH3 amino terminus | |
| L-peptide linking | |
| L-saccharide | |
| L-saccharide 1,4 and 1,4 linking | |
| L-saccharide 1,4 and 1,6 linking | |
| RNA OH 3 prime terminus | |
| RNA OH 5 prime terminus | |
| RNA linking | |
| non-polymer | |
| other | |
| peptide linking | |
| peptide-like | |
| saccharide |