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more general categories information about this item 4. Semantic Terms 4. Semantic Terms Entity [STY:T071] (48056) Physical Object [STY:T072] (47583) Substance [STY:T167] (46174) Chemical [STY:T103] (46110) Chemical Viewed Structurally [STY:T104] (44741) Organic Chemical [STY:T109] (44144) D03. Heterocyclic Compounds D03. Heterocyclic Compounds Heterocyclic Compounds [MESH:D006571] (56330) Heterocyclic Compounds, 1-Ring [MESH:D006573] (30631) Azoles [MESH:D001393] (10398) Pyrroles [MESH:D011758] (2361) Tetrapyrroles [MESH:D045725] (1116) Porphyrins [MESH:D011166] (952) Protoporphyrins [MESH:D011524] (37) Heterocyclic Compounds with 4 or More Rings [MESH:D006576] (2763) Tetrapyrroles [MESH:D045725] (1116) Porphyrins [MESH:D011166] (952) Protoporphyrins [MESH:D011524] (37) D04. Polycyclic Compounds D04. Polycyclic Compounds Polycyclic Compounds [MESH:D011083] (22048) Macrocyclic Compounds [MESH:D047028] (4784) Tetrapyrroles [MESH:D045725] (1116) Porphyrins [MESH:D011166] (952) Protoporphyrins [MESH:D011524] (37) D23. Biological Factors D23. Biological Factors Biological Factors [MESH:D001685] (12003) Pigments, Biological [MESH:D010860] (2018) Porphyrins [MESH:D011166] (942) Protoporphyrins [MESH:D011524] (37)