# RCSB Python Chemical Reference Utility Classes
[](https://dev.azure.com/rcsb/RCSB%20PDB%20Python%20Projects/_build/latest?definitionId=6&branchName=master)
## Introduction
This module contains a collection of utility classes for accessing and packaging
PDB chemical reference data.
### Installation
Download the library source software from the project repository:
```bash
git clone --recurse-submodules https://github.com/rcsb/py-rcsb_utils_chemref.git
```
Optionally, run test suite (Python versions 2.7, 3.6, and 3.8) using
[setuptools](https://setuptools.readthedocs.io/en/latest/) or
[tox](http://tox.readthedocs.io/en/latest/example/platform.html):
```bash
python setup.py test
or simply run
tox
```
Installation is via the program [pip](https://pypi.python.org/pypi/pip).
```bash
pip install rcsb.utils.chemref
or install the local repository using:
pip install -e .
```
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