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Names | |
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IUPAC name 2-Hydroxy-3-(2-hydroxy-4-methoxy-6-propylbenzoyl)oxy-4-methoxy-6-propylbenzoic acid | |
Identifiers | |
3D model (JSmol) | |
ChEBI | |
ChEMBL | |
ChemSpider | |
PubChem CID | |
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Properties | |
C22H26O8 | |
Molar mass | 418.442 g·mol−1 |
Appearance | Rectangular prisms or rhombic plates |
Melting point | 150–151 °C (302–304 °F; 423–424 K) |
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). |
Sekikaic acid is an organic compound in the structural class of chemicals known as depsides. It is found in some lichens. First isolated from Ramalina sekika , it is a fairly common lichen product in Ramalina and Cladonia , both genera of lichen-forming fungi. [1] The species epithet of the powdery lichen Lepraria sekikaica refers to the presence of this substance—a rarity in genus Lepraria . [2]
In its purified form, sekikaic acid exists as colourless rectangular prisms or rhombic plates. Its molecular formula is C22H2608. It has a melting point of 150–151 °C (302–304 °F). An ethanolic solution of sekikaic acid reacts with iron(III) chloride to produce a violet colour. Its ultraviolet spectrum has three peaks of maximum absorption (λmax) at 219, 263, and 303 nm. [3]
Sekikaic acid has been demonstrated to have several biological activities in laboratory experiments. These include antioxidant activity, [4] inhibition of the enzymes α-glucosidase and α-amylase, hypoglycemic activity, and lipid-lowering activity. [5] It also has antiviral activity against Respiratory syncytial virus, even more so than the standard antiviral medication ribavirin. [6]
The sekikaic acid chemosyndrome contains similar compounds that are metabolically related to sekikaic acid. It comprises sekikaic acid as the major compound, and 4'O-demethylsekikaic and homosekikaic acids as satellite metabolites. [7]