<http://ns.inria.fr/covid19/PMC7314687#body_text>	<http://purl.org/dc/terms/subject>	"Physical chemistry" .
<http://ns.inria.fr/covid19/PMC7314687#body_text>	<http://purl.org/dc/terms/subject>	"Diketones" .
<http://ns.inria.fr/covid19/PMC7314687#body_text>	<http://purl.org/dc/terms/subject>	"Independent cities in the United States" .