PMC:7291971 / 40162-40165 JSONTXT

{"project":"LitCovid-PMC-OGER-BB","denotations":[{"id":"T834","span":{"begin":0,"end":3},"obj":"CHEBI:36927;CHEBI:36927"},{"id":"T39500","span":{"begin":0,"end":3},"obj":"CHEBI:36927;CHEBI:36927"}],"text":"13C"}