All phycal entites stored in Bio2RDF Atlas

Database: 
Statement: 

All physical entities stored in Bio2RDF Atlas. A limit of results per page $number$ (e.g., 10)

Query: 
select * where{ ?s a <http://bio2rdf.org/ns/pubmed#Chemical> . ?s <http://www.w3.org/2000/01/rdf-schema#label> ?label . } Limit ??number