| Mao-to, a Chinese herbal medicinal prescription was studied for the
inhibitory activity of adenosine 3',5'-cyclic monophosphate (cAMP)
phosphodiesterase. The inhibitory activity for this enzyme depended
mainly on Ephedra herb and Glycyrrhiza in this prescription. Apricot
kennel acted as a mitigatory component for Ephedra herb in cAMP
phosphodiesterase inhibitory test. In ephedrine and the related
compounds the inhibitory activity of cAMP phosphodiesterase was not
shown.
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