4-Carboxybenzo-15-crown 5-Ether CAS No:56683-55-7

4-Carboxybenzo-15-crown 5-Ether/ 2,3,5,6,8,9,11,12-Octahydrobenzo[b][1,4,7,10,13]pentaoxacyclopentadecine-15-carboxylic acid/CAS No:56683-55-7 is a crown ether that has been used to bind and isolate fatty acids in biological systems. It has been shown to have anti-cancer properties and has also been used as an immobilizing agent for radioactive sodium and potassium ions. 4-Carboxybenzo-15-crown 5-Ether is a water soluble, colorless compound with a molecular weight of 230.7 g/mol. The crown ether is made up of two benzene rings linked together by one oxygen atom with four sulfur atoms at the corners. The crown ethers are classified as "overlapped" due to the fact that they have 2 hydrogens attached to each of the 2 oxygen atoms and 2 oxygens attached to each of the 2 sulfur atoms, which allows them to bind with water molecules more easily than other types of crown ethers. 

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