D011166Chemicals & DrugsD03.383.129.578.840.500D03.633.400.909.500D04.345.783.500D23.767.727Porphyrinsprns:meshDescriptorUIMeSH DescriptorUIprns:meshSemanticGroupNameMeSH semantic group nameprns:meshTreeNumberMeSH tree numberrdf:typetyperdfs:labellabelConcept