PMC:7291971 / 14122-14139 JSONTXT

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    LitCovid-PMC-OGER-BB

    {"project":"LitCovid-PMC-OGER-BB","denotations":[{"id":"T328","span":{"begin":0,"end":17},"obj":"CHEBI:51087;CHEBI:51087"}],"text":"protecting groups"}