Data Item _chem_comp.formula
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General 
- Item name
- _chem_comp.formula
- Category name
- chem_comp
- Attribute name
- formula
- Required in PDB entries
- no
- Used in current PDB entries
- Yes, in about 100.0 % of entries
- Used in the Chemical Component dictionary
- Yes
Item Description
The empirical chemical formula for the chemical component.
Item Example
C9 H11 N O3
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|^-]*