PMC:7291971 / 68229-68232 JSONTXT

{"project":"LitCovid-PMC-OGER-BB","denotations":[{"id":"T1377","span":{"begin":0,"end":3},"obj":"CHEBI:36927;CHEBI:36927"},{"id":"T29610","span":{"begin":0,"end":3},"obj":"CHEBI:36927;CHEBI:36927"}],"text":"13C"}