<http://linkedlifedata.com/resource/pubmed/chemical/protocatechuic+acid> <http://www.w3.org/1999/02/22-rdf-syntax-ns#type> <http://linkedlifedata.com/resource/pubmed/Chemical> .
<http://linkedlifedata.com/resource/pubmed/chemical/protocatechuic+acid> <http://www.w3.org/2000/01/rdf-schema#label> "protocatechuic acid" .
<http://linkedlifedata.com/resource/pubmed/chemical/protocatechuic+acid> <http://linkedlifedata.com/resource/pubmed/registryNumber> "99-50-3" .