Data Item _pdbx_nmr_chem_shift_ref.ref_method
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General 
- Item name
- _pdbx_nmr_chem_shift_ref.ref_method
- Category name
- pdbx_nmr_chem_shift_ref
- Attribute name
- ref_method
- Required in PDB entries
- no
- Required for PDB deposition
- yes
- Used in currrent PDB entries
- No
Item Description
The chemical shift reference may be either internal (the compound is located
in the sample) or external (the compound is in a container external to the sample).
Additional Descriptive Information for Depositors
The reference molecule may be either internal (the compound is within the sample) or external (the reference compound is in a separate sample or capillary tube).
Item Example
internal
Additional Item Example for Depositors
external (capillary)
Data Type 
- Data type code
- line
- Data type detail
- char item types / multi-word items ...
- Primitive data type code
- char
- Regular expression
- [][ \t_(),.;:"&<>/\{}'`~!@#$%?+=*A-Za-z0-9|^-]*
Controlled Vocabulary
| Allowed Value | Details |
|---|---|
| external | |
| internal | |
| na | not applicable |
Controlled Vocabulary at Deposition
| Allowed Value | Details |
|---|---|
| external | |
| internal | |
| na | not applicable |