Abstract: The invention provides a pharmaceutical composition for preventing restens by the inhibition of vascular smooth muscle cell proliferation, comprising a compound of formula I: ##STR1## wherein: n=1 or 2 R.sub.1 is a member of the group consisting of hydrogen, halogen, nitro, benzo, lower alkyl, phenyl and lower alkoxy;R.sub.2 is a member of the group consisting of hydroxy, acetoxy, and lower alkoxy, andR.sub.3 is a member of the group consisting of hydrogen and lower alkenoxy-carbonylas active ingredient therein, and the physiologically acceptable salts thereof, in combination with a pharmaceutically acceptable carrier.