> For the complete documentation index, see [llms.txt](https://semanticchemistdocs.knowledgator.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://semanticchemistdocs.knowledgator.com/welcome-to-semantic-chemist-documentation.md).

# Welcome to Semantic Chemist documentation!

## Overview

The Semantic Chemist DB manages data about chemical substances that can be found on PubChem. The API supports the following types of requests:

* **Search by SMILES**: Allows users to search for chemical substances using their SMILES (Simplified Molecular Input Line Entry System) notation.
* **Search by IUPAC**: Enables searching by the International Union of Pure and Applied Chemistry (IUPAC) name of the chemical substance.
* **Search by Name**: Supports searches by both IUPAC names and synonyms of the chemical substance.
* **Search by CID**: Allows users to search using the PubChem Compound Identifier (CID).

See more about API entry points here:

{% content-ref url="/pages/68U0SgXAhMW7KR4kzNLK" %}
[Search by SMILES](/api/search-by-smiles.md)
{% endcontent-ref %}

{% content-ref url="/pages/zRgYrhxxgw3oJUXnoeEz" %}
[Search by IUPAC](/api/search-by-iupac.md)
{% endcontent-ref %}

{% content-ref url="/pages/Sd5H7iFDj4F0RjDj6iNx" %}
[Search by Name](/api/search-by-name.md)
{% endcontent-ref %}

{% content-ref url="/pages/E4cfS49rwmNbyC4zdjPI" %}
[Search by InChI](/api/search-by-inchi.md)
{% endcontent-ref %}

{% content-ref url="/pages/PTcyVZFUFsWZaRxAxuNn" %}
[Search by InChIKey](/api/search-by-inchikey.md)
{% endcontent-ref %}

{% content-ref url="/pages/NVo9YjOB7CMZqt64iBOw" %}
[Search by CID](/api/search-by-cid.md)
{% endcontent-ref %}


---

# Agent Instructions
This documentation is published with GitBook. GitBook is the documentation platform designed so that both humans and AI agents can read, navigate, and reason over technical content effectively. Learn more at gitbook.com.

## Querying This Documentation
If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question.

Perform an HTTP GET request on the current page URL with the `ask` query parameter:

```
GET https://semanticchemistdocs.knowledgator.com/welcome-to-semantic-chemist-documentation.md?ask=<question>
```

The question should be specific, self-contained, and written in natural language.
The response will contain a direct answer to the question and relevant excerpts and sources from the documentation.

Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.