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The reactions of 6-methoxybenzo[b]furan-3(2H)-one with 2-aryl-1,1- dicyanoethylenes and malononitrile or with aromatic aldehyde and two moles of malononitrile afford 2-amino-4-aryl-1,3-dicyano-7-methoxydibenzo[b,d]furans. The reactions of benzo[b]thiophen-3(2H)-one with 2-aryl-1,1-dicyanoethylenes or with aromatic aldehyde and one mole of malononitrile produce 2-amino-4-aryl-3-cyano-4H-benzothieno[3,2-b]pyrans.
One of the oldest and most widely used commercial enzyme inhibitors is aspirin, Electric Literature of 130-03-0, which selectively inhibits one of the enzymes involved in the synthesis of molecules that trigger inflammation. you can also check out more blogs about Electric Literature of 130-03-0
Reference：
Benzothiophene – Wikipedia,
Benzothiophene | C8H6S – PubChem