Abstract: This invention provides smooth muscle cell proliferation inhibitors of formula I having the structure R1, R2, R3, R4, R5, R6, R7, R8, R9 and R10, are each, independently, hydrogen, acyl of 2-7 carbon atoms, perfluoroacyl of 2-10 carbon atoms, alkyl of 1-6 carbon atoms, perfluoroalkyl of 1-6 carbon atoms, benzoyl, benzyl or —SO3M; M is hydrogen, lithium, sodium, potassium or ammonium; R11 is hydrogen, alkyl of 1-6 carbon atoms, perfluoroalkyl of 1-6 carbon atoms, halogen, nitrile, nitro, or alkoxy of 1-6 carbon atoms; R12 is hydrogen, nitro, amino, acylamino of 2-7 carbon atoms, perfluoroacylamino of 2-7 carbon atoms, alkylamino of 1-6 carbon atoms, perfluoroalkylamino of 1-6 carbon atoms, dialklylamino where each alkyl chain is independently 1-6 carbon atoms, perfluorodialklylamino where each alkyl chain is independently 1-6 carbon atoms alkylsulfonylamino of 1-6 carbon atoms, perfluoroalkylsulfonylamino of 1-6 carbon atoms, arylsulfonylamino of 6-10 carbon atoms or arylsulfonylamin