> For the complete documentation index, see [llms.txt](https://docs.snomed.org/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.snomed.org/education/snomed-ct-education-editorial-guide/readme/authoring/domain-specific-modeling/substance/substance-naming-and-modeling-conventions/guidelines-for-specific-substance-types/saturated-or-unsaturated-substances.md).

# Saturated or unsaturated substances

<mark style="color:$danger;">**This Editorial Guide is used for Education Purposes Only. It is used in the Authoring Courses and Certifications. It is based on the January 2026 Editorial Guide.**</mark>

## Modeling

<table data-header-hidden><thead><tr><th width="199.94140625"></th><th></th></tr></thead><tbody><tr><td><strong>Parent concept</strong></td><td>Most distal appropriate descendant of 115668003 |Biological substance (substance)|</td></tr><tr><td><strong>Semantic tag</strong></td><td>(substance)</td></tr><tr><td><strong>Definition status</strong></td><td>Primitive</td></tr><tr><td><strong>Attribute</strong></td><td>None</td></tr></tbody></table>

## Naming

### FSN

Saturated X (substance)

Unsaturated X (substance)

For example,

* Unsaturated adipate (substance)

***

### Preferred Term

Saturated X

Unsaturated X

For example,

* Unsaturated adipate

***

### Synonyms

X Saturated or X Unsaturated

For example,

* Adipate unsaturated

## Exemplar

The following illustrates the **stated** and **inferred** view:

<div align="left"><figure><img src="/files/Bh9zjajIwwZteQiayJ5c" alt="" width="563"><figcaption></figcaption></figure></div>

<figure><img src="https://github.com/SNOMED-Documents/snomed-editorial-guide/blob/main/authoring/substance/images/174691570.png" alt=""><figcaption></figcaption></figure>

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