PMC:7291971 / 73549-73552 JSONTXT

{"project":"LitCovid-PMC-OGER-BB","denotations":[{"id":"T1470","span":{"begin":0,"end":3},"obj":"CHEBI:36927;CHEBI:36927"},{"id":"T8921","span":{"begin":0,"end":3},"obj":"CHEBI:36927;CHEBI:36927"}],"text":"13C"}