PMC:7594251 / 117497-117539 JSONTXT

{"project":"LitCovid-sentences","denotations":[{"id":"T798","span":{"begin":0,"end":42},"obj":"Sentence"}],"namespaces":[{"prefix":"_base","uri":"http://pubannotation.org/ontology/tao.owl#"}],"text":"I and S represent two heteronuclear spins."}