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Get article metadata

This E-Summary call retrieves article metadata for a PMCID:

https://eutils.ncbi.nlm.nih.gov/entrez/eutils/esummary.fcgi?db=pmc&id=7840891&retmode=json

The returned data includes the PubMed ID (PMID) for this article, so you can do a further call to get PubMed metadata for the same article:

https://eutils.ncbi.nlm.nih.gov/entrez/eutils/esummary.fcgi?db=pubmed&id=33248227&retmode=json

You can use E-Fetch with PubMed to get even more:

https://eutils.ncbi.nlm.nih.gov/entrez/eutils/efetch.fcgi?db=pubmed&id=33248227

Use the OAI-PMH service to get metadata in Dublin Core format:

https://www.ncbi.nlm.nih.gov/pmc/oai/oai.cgi?verb=GetRecord&identifier=oai:pubmedcentral.nih.gov:7840891&metadataPrefix=oai_dc

Or in PMC front-matter format:

https://www.ncbi.nlm.nih.gov/pmc/oai/oai.cgi?verb=GetRecord&identifier=oai:pubmedcentral.nih.gov:7840891&metadataPrefix=pmc_fm