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more general categories information about this item D02. Organic Chemicals D02. Organic Chemicals Organic Chemicals [MESH:D009930] (75987) Hydrocarbons [MESH:D006838] (35762) Hydrocarbons, Acyclic [MESH:D006839] (3563) Alkenes [MESH:D000475] (2079) Vinyl Compounds [MESH:D014753] (440) Polyvinyls [MESH:D011145] (264) Povidone [MESH:D011205] (51) 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) Pyrrolidines [MESH:D011759] (1548) Pyrrolidinones [MESH:D011760] (778) Povidone [MESH:D011205] (54) 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) D05. Macromolecular Substances D05. Macromolecular Substances Macromolecular Substances [MESH:D046911] (6105) Polymers [MESH:D011108] (5206) Plastics [MESH:D010969] (1759) Polyvinyls [MESH:D011145] (262) Povidone [MESH:D011205] (54) D23. Biological Factors D23. Biological Factors Biological Factors [MESH:D001685] (12003) Pigments, Biological [MESH:D010860] (2018) Porphyrins [MESH:D011166] (942) Protoporphyrins [MESH:D011524] (37) D25. Biomedical and Dental Materials D25. Biomedical and Dental Materials Polymers [MESH:D011108] (3436) Plastics [MESH:D010969] (1758) Polyvinyls [MESH:D011145] (262) Povidone [MESH:D011205] (54) J. Technology, Industry, Agriculture J. Technology, Industry, Agriculture Technology, Industry, and Agriculture [MESH:D013676] (4406) Manufactured Materials [MESH:D008420] (4216) Biomedical and Dental Materials [MESH:D001697] (4055) Polymers [MESH:D011108] (3429) Plastics [MESH:D010969] (1758) Polyvinyls [MESH:D011145] (262) Povidone [MESH:D011205] (54)