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Abstract

A new use of, and method of treatment using, a compound selected from the group consisting essentially of compounds of Formula I: ##STR1## wherein: R.sub.1 is hydrogen, lower alkanoyl of up to 6 carbon atoms or aroyl selected from benzoyl and naphthoyl; R.sub.2 is hydrogen, lower alkyl of up to 6 carbon atoms or arylalkyl selected from benzyl, phenylethyl and phenylpropyl; R.sub.3 is hydrogen or lower alkyl of up to 6 carbon atoms; R.sub.4 is hydrogen or lower alkyl of up to 6 carbon atoms, or when X is oxygen, R.sub.4 together with R.sub.5 can represent --CH.sub.2 --O--; X is a valency bond, --CH.sub.2, oxygen or sulfur; Ar is selected from phenyl, naphthyl, indanyl and tetrahydronaphthyl; R.sub.5 and R.sub.6 are individually selected from hydrogen, fluorine, chlorine, bromine, hydroxyl, lower alkyl of up to 6 carbon atoms, a --CONH.sub.2 -- group, lower alkoxy of up to 6 carbon atoms, benzyloxy, lower alkylthio of up to 6 carbon atoms, lower alkysulphinyl of up to 6 carbon atoms and lower alkylsulphonyl of up to 6 carbon atoms; or R.sub.5 and R.sub.6 together represent methylenedioxy; or a pharmaceutically acceptable salt thereof, for inhibition of proliferation of smooth muscle cells. The new use of, and method of treatment using, the present antiproliferative compounds prevent restenosis following percutaneous transluminal coronary angioplasty (PTCA) and prevent development of atherosclerosis.

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