<http://ns.inria.fr/covid19/PMC6027677#body_text>	<http://purl.org/dc/terms/subject>	"Nitrogen(\u22123) compounds" .
<http://ns.inria.fr/covid19/PMC6027677#body_text>	<http://purl.org/dc/terms/subject>	"Medical mnemonics" .
<http://ns.inria.fr/covid19/PMC6027677#body_text>	<http://purl.org/dc/terms/subject>	"Petrochemicals" .