The synthesis, antispasmodic activity and toxicity of a number of 2-diethylaminoethyl ester hydrochlorides of a-substituted 2-thienylacetic acids were reported in the first paper2 of this series. Two of the compounds described therein, namely, 2-diethylaminoethyl a-(Z- cyclopenten-l-yI)-Z-thi-enylacetate hydrochloride [I, R= 1-(2-C5H7) l3 and its 2-cyclohexen-1- yl homolog [I, R= 1-(2-CoHg)] were found to possess in vitro and in vivo antispasmodic ...