Abstract
Comparison of monoamine oxidase (MAO) inhibiting properties of iproniazid and its phenyl congener, l-isonicotinyl-2-phenylisopropylhydrazine showed the latter to be 1.5 to 2 times as effective in inhibiting MAO both in vitro and in vivo. The addition of a phenyl group to the isopropyl chain of iproniazid enhances MAO inhibitory properties. Comparisons with beta-phenyl-isopropylhydrazine also indicate that the isonicotinyl group hinders the MAO inhibiting property of the former compound.