<http://linkedlifedata.com/resource/pubmed/chemical/protoporphyrin+IX> <http://www.w3.org/1999/02/22-rdf-syntax-ns#type> <http://linkedlifedata.com/resource/pubmed/Chemical> .
<http://linkedlifedata.com/resource/pubmed/chemical/protoporphyrin+IX> <http://www.w3.org/2000/01/rdf-schema#label> "protoporphyrin IX" .
<http://linkedlifedata.com/resource/pubmed/chemical/protoporphyrin+IX> <http://linkedlifedata.com/resource/pubmed/registryNumber> "553-12-8" .