The MDL number contains a unique identification number for each reaction and variation. The format is RXXXnnnnnnnn. R indicates a reaction, XXX indicates which database contains the reaction record. The numeric portion, nnnnnnnn, is an 8-digit number. [wikipedia]

Prefix
mdl
Links
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Pattern for Local Unique Identifiers

Local identifiers in Molecular Design Limited Hash should match this regular expression:
^\w{4}\d{8}$

Example Local Unique Identifier
MFCD00011659
Pattern for CURIES

Compact URIs (CURIEs) constructed from Molecular Design Limited Hash should match this regular expression:
^mdl:\w{4}\d{8}$

Example CURIE
mdl:MFCD00011659
References
Other https://en.wikipedia.org/wiki/Chemical_file_format#MDL_number
Contributors
Ontology

A summary of the relations in the Bioregistry schema can be found here.

Appears In (1) (bioregistry.schema:0000018 )
XLMOD
Providers

A provider turns a local unique identifiers from a resource into a URI. Many providers are also resolvable as URLs (i.e., they can be used in a web browser).

This resource does not have any providers. Please consider contributing one after reading the curation guide.