---
id: "inchlkey"
kind: "datatype"
status: "stable"
is_pii: false
categories: ["chemistry"]
langs: ["common"]
quality: 95
url: "http://registry.apicrafter.io/datatype/inchlkey"
---

# International Chemical Identifier Key (InChIKey) (`inchlkey`)

InChIKey: a fixed-length hashed form of the InChI chemical identifier, written as three hyphen-separated blocks of 14, 10 and 1 uppercase letters.

- Personal data (PII): no
- Categories: Chemistry (chemistry)
- Countries: global
- Languages: Common to most languages (common)
- Classification: identifier

## Detection

Regular expression (Python `re`):

```
^[A-Z]{14}-[A-Z]{10}-[A-Z]$
```

## Examples

- `LFQSCWFLJHTTHZ-UHFFFAOYSA-N` — ethanol
- `PCHJSUWPFVWCPO-UHFFFAOYSA-N` — gold

## Mappings

- bioregistry: `inchikey`
- schema_org: `inChIKey`
- wikidata: `P235`

## Metacrafter rules

2 rules: 1 match the field name, 1 match values.

- `inchikeybyfieldname` (field, `common/chemistry.yaml`)
- `inchikeybyvalue` (data, `common/chemistry.yaml`)

## Supported by tools

- `metacrafter`

## Translations

- ru: Международный текстовый химический идентификатор (ключ): Международный текстовый химический идентификатор (ключ)

## Sources

- wikidata: <https://www.wikidata.org/wiki/Property:P235>
- bioschemas: <https://bioschemas.org/types/MolecularEntity/0.3-RELEASE-2019_09_02#inChIKey>
- schema.org: <https://schema.org/inChIKey>
- wikipedia: <https://en.wikipedia.org/wiki/International_Chemical_Identifier>

## Quality

Score 95/100. Missing: negative example.

JSON: <http://registry.apicrafter.io/api/v1/datatypes/inchlkey.json> · Edit: <https://github.com/apicrafter/metacrafter-registry/edit/main/data/datatypes/any/chemistry/inchlkey.yaml>