1.0 2010-04-08 22:11:29 UTC 2025-11-19 00:49:57 UTC FDB014824 Physcion Physcion, also known as emodin monomethyl ether or parienin, is a member of the class of compounds known as anthraquinones. Anthraquinones are organic compounds containing either anthracene-9,10-quinone, 1,4-anthraquinone, or 1,2-anthraquinone. Physcion is practically insoluble (in water) and a very weakly acidic compound (based on its pKa). Physcion can be synthesized from 2-methylanthraquinone. Physcion can also be synthesized into torososide B and physcion 8-gentiobioside. Physcion can be found in common sage, garden rhubarb, and sorrel, which makes physcion a potential biomarker for the consumption of these food products. Physcion has also been shown to protect lichens against UV-B light, at high altitudes in Alpine regions. The UV-B light stimulates production of parietin and the parietin protects the lichens from damage. Lichens in arctic regions such as Svarlbard retain this capability though they do not encounter damaging levels of UV-B, a capability that could help protect the lichens in case of Ozone layer thinning . 1,8-Dihydroxy-3-methoxy-6-methyl-9,10-anthracenedione 1,8-Dihydroxy-3-methoxy-6-methyl-anthraquinone 1,8-dihydroxy-3-methoxy-6-methylanthracene-9,10-dione 1,8-Dihydroxy-3-methoxy-6-methylanthraquinone 1,8-Dihydroxy-3-methyl-6-methoxy-9,10-anthraquinone 9, 10-Anthracenedione, 1,8-dihydroxy-3-methoxy-6-methyl- 9,10-Anthracenedione, 1,8-dihydroxy-3-methoxy-6-methyl- Anthraquinone, 1,8-dihydroxy-3-methoxy-6-methyl- Emodin 3-methyl ether Emodin-3-methyl ether Methoxyemodin Methylemodin Parietin Physcic acid Physcion Physcion (senna) Physcione Przewalskinone B Rheochrysidin C16H12O5 284.2635 284.068473494 1,8-dihydroxy-3-methoxy-6-methyl-9,10-dihydroanthracene-9,10-dione physcion 521-61-9 COC1=CC2=C(C(O)=C1)C(=O)C1=C(C=C(C)C=C1O)C2=O InChI=1S/C16H12O5/c1-7-3-9-13(11(17)4-7)16(20)14-10(15(9)19)5-8(21-2)6-12(14)18/h3-6,17-18H,1-2H3 FFWOKTFYGVYKIR-UHFFFAOYSA-N belongs to the class of organic compounds known as anthraquinones. These are organic compounds containing either anthracene-9,10-quinone, 1,4-anthraquinone, or 1,2-anthraquinone. Anthraquinones Organic compounds Benzenoids Anthracenes Anthraquinones Aromatic homopolycyclic compounds 1-hydroxy-2-unsubstituted benzenoids 1-hydroxy-4-unsubstituted benzenoids Alkyl aryl ethers Anisoles Aryl ketones Hydrocarbon derivatives Organic oxides Vinylogous acids 1-hydroxy-2-unsubstituted benzenoid 1-hydroxy-4-unsubstituted benzenoid 9,10-anthraquinone Alkyl aryl ether Anisole Anthraquinone Aromatic homopolycyclic compound Aryl ketone Ether Hydrocarbon derivative Ketone Organic oxide Organic oxygen compound Organooxygen compound Vinylogous acid Anthraquinone type logp 2.95 ALOGPS logs -3.52 ALOGPS solubility 8.67e-02 g/l ALOGPS melting_point Mp 209-210° logp 3.97 ChemAxon pka_strongest_acidic 7.89 ChemAxon pka_strongest_basic -4.9 ChemAxon iupac 1,8-dihydroxy-3-methoxy-6-methyl-9,10-dihydroanthracene-9,10-dione ChemAxon average_mass 284.2635 ChemAxon mono_mass 284.068473494 ChemAxon smiles COC1=CC2=C(C(O)=C1)C(=O)C1=C(C=C(C)C=C1O)C2=O ChemAxon formula C16H12O5 ChemAxon inchi InChI=1S/C16H12O5/c1-7-3-9-13(11(17)4-7)16(20)14-10(15(9)19)5-8(21-2)6-12(14)18/h3-6,17-18H,1-2H3 ChemAxon inchikey FFWOKTFYGVYKIR-UHFFFAOYSA-N ChemAxon polar_surface_area 83.83 ChemAxon refractivity 76.62 ChemAxon polarizability 28.69 ChemAxon rotatable_bond_count 1 ChemAxon acceptor_count 5 ChemAxon donor_count 2 ChemAxon physiological_charge 0 ChemAxon formal_charge 0 ChemAxon Specdb::CMs 83535 Specdb::MsMs 94434 Specdb::MsMs 94435 Specdb::MsMs 94436 Specdb::MsMs 158457 Specdb::MsMs 158458 Specdb::MsMs 158459 Common sage Type 1 specific Salvia officinalis 38868 Garden rhubarb Type 1 specific Rheum rhabarbarum 3621 Sorrel Type 1 specific Rumex acetosa 41241 Anti septic 603 A substance that kills or slows the growth of microorganisms, including bacteria, viruses, fungi and protozoans. Calcium antagonist 748 Substance that attaches to and blocks cell receptors that normally bind naturally occurring substances. Cathartic 784 Any substance that accelerates defecation. Compare with laxatives, which are substances that ease defecation (usually by softening faeces). A substance can be both a laxative and a cathartic. Pesticide 1210 Strictly, a substance intended to kill pests. In common usage, any substance used for controlling, preventing, or destroying animal, microbiological or plant pests. Purgative 1275 An agent that produces a soft formed stool, and relaxes and loosens the bowels, typically used over a protracted period, to relieve constipation. Compare with cathartic, which is a substance that accelerates defecation. A substances can be both a laxative and a cathartic.