# Chemistry
## Overview
Below is a list of chemical-related column widgets.
* [Chemical structure](#chemical-structure) - Display chemical structure from a chemical drawing section
* [SMILES structure](#smiles-structure) - Display chemical structure from SMILES
* Molecular formula
* Image
## Chemical Structure
Use this widget to display the chemical structure from a chemical drawing section. The widget cannot create or draw chemical structures; it can only display chemical structures from chemical drawing sections.
**Readonly view:**
**Edit view:**
**Form view:**
Not supported
**Configuration**
```json
{
"should_auto_update": false, # (optional), default to false.
# If true, the widget will perform live calculation
# If false, the user have to click reload to update the value
"should_auto_update_when_empty": true, # (optional), default to true.
# If true, the widget will perform live calculation when the data is empty
# If false, the results will not be calculated on default
}
```
**Import value:**
Not supported
## SMILES Structure
This widget uses [Smiles Drawer](https://github.com/reymond-group/smilesDrawer#readme) to draw the chemical structure from SMILES.
**Readonly view:**
Click the 'Generate SMILES' button to create molecular weight based on the chemical name.
**Edit view:**
**Form view:**
Same as the edit view.
**Configuration:**
Not supported
**Import value:**
SMILES string.
## Molecular Formula
This widget can:
1. Generate molecular formula from the name
2. Generate molecular weight
3. Generate SMILES (Simplified molecular-input line-entry system)
4. Generate molecular structure
This widget requires the creation of these columns before it can be used. By default, these columns are created automatically in the chemical table.
* molecular\_weight
* SMILES
* molecular\_structure
> Some function of [chemcalc](https://www.npmjs.com/package/chemcalc) is used for this widget.
>
> ChemCalc: a building block for tomorrow’s chemical infrastructure. Patiny, Luc; Borel, Alain Journal of Chemical Information and Modeling 2013. DOI:10.1021/ci300563h
Click the **Generate formula** button to get the molecular formula directly from the name. You can also click **Edit** button to enter the molecular formula manually.
**Edit view:**
**Readonly view:**
Click the **Generate data** button to generate the molecular weight, SMILES, and molecular structure.
**Form view:**
Same as the edit view
**Configuration**:
```json
{
"should_use_mw": false, # optional, if false, nominal mass will be used.
"molecular_weight": {"sid":"xxx", "name":"xxx"},
"SMILES": {"sid":"xxx", "name":"xxx"},
"molecular_structure": {"sid":"xxx", "name":"xxx"}
}
```
**Import value:**
Formula string.
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