The repository Chemotion supports the OAI-PMH protocol, which is a widely used protocol for exposing metadata records in a standardized way and which can be harvested and aggregated by other systems. OAI-PMH provides access to metadata records at various levels, including individual and sets of records. For example, by using the "ListRecords" verb and applying filters such as the metadata prefix "oai_dc" and a date range users can obtain a list of complete records in Dublin Core format from the repository Chemotion . Similarly, by using the "GetRecord" verb and applying filters such as the metadata prefix "oai_DataCite" and specifying an identifier like a sample DOI, users can retrieve a specific sample record, and therefore, access specific metadata from the Chemotion Repository in DataCite format. The protocol supports multiple metadata formats, such as Dublin Core and DataCite which allow easy interoperability of the Chemotion repository with other systems such as the NFDI4Chem search service . Once the user finds the required sample information, all available metadata are directly accessible by their DOI identifier without further authentication and authorization processes. The metadata are accessible, even when the materials are no longer available, and allow the constant link to the analytical data.