Guvacine is a tetrahydropyridine alkaloid found in areca nuts. It is the N-demethylated derivative of arecaidine and the product of ester hydrolysis of guvacoline, both of which are also found in areca nuts as well. It is also an inhibitor of gamma-aminobutyric acid uptake. Lime hydrolyzes guvacoline to guvacine.
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