This invention provides smooth muscle cell proliferation inhibitors of formula I having the structure wherein R1, R2, R3, R4, and R5 are each, independently, hydrogen, acyl of 2-7 carbon atoms, haloacyl of 2-7 carbon atoms, nitroacyl of 2-7 carbon atoms, cyanoacyl of 2-7 carbon atoms, trifluoromethylacyl of 3-8 carbon atoms, or benzoyl in which the phenyl moiety is substituted with R8; R6 and R7 are each, independently, —OH, —OR9, O-tert-butyldimethylsilyl, O-trialkylsilyl of 1-6 carbon atoms per alkyl moiety, O-triphenylsilyl, R8, R10, R11, and R12 are each, independently, hydrogen, —CN, —NO2, halogen, CF3, alkyl of 1-6 carbon atoms, acetyl, benzoyl, or alkoxy of 1-6 carbon atoms; R9 is acyl of 2-7 carbon atoms, haloacyl of 2-7 carbon atoms, nitroacyl of 2-7 carbon atoms, cyanoacyl of 2-7 carbon atoms, trifluoromethylacyl of 3-8 carbon atoms, or benzoyl in which the phenyl moiety is substituted with R8; Y is O, S, NH, NMe, or CH2; W is halogen, —CN, CF3, alkyl of 1-6 carbon atoms, haloalkyl of 1-6 carbon atoms, nitroalkyl of 1-6 carbon atoms, cyanoalkyl of 1-6 carbon atoms, alkoxyalkyl of 2-12 carbon atoms, alkoxy of 1-6 carbon atoms, or phenyl mono-, di-, or tri-substituted with R8; Z is —NO2, —NH2, —NHR13, or —NHCO-Het; R13 is acyl of 2-7 carbon atoms, haloacyl of 2-7 carbon atoms, nitroacyl of 2-7 carbon atoms, cyanoacyl of 2-7 carbon atoms, trifluoromethylacyl of 3-8 carbon atoms, benzoyl in which the phenyl moiety is substituted with R8, or R13 is an α-amino acid in which the a carboxyl group forms an amide with the nitrogen of Z, wherein if said amino acid is glutamic acid or aspartic acid, the non-α carboxylic acid is an alkyl ester in which the alkyl moiety contains from 1-6 carbon atoms; Het is pyridyl substituted with R8, thienyl substituted with R8, furyl substituted with R8, oxazolyl substituted with R8, pyrazinyl substituted with R8, pyrimidinyl substituted with R8, or thiazolyl substituted with R8; R14 is R8, —NH2, —CO2H, or —NH-acyl of 2-7 carbon atoms; n=0-3; with the proviso that when Z is —NHR13 and Y is O, at least one of R1, R2, R3, R4, and R5 is hydrogen, or at least one of R6 and R7 is OH, or a pharmaceutically acceptable salt thereof.