Novel derivatives of genistein and pharmacological agents containing such derivatives

Genistein derivatives of Formula (1), wherein R1 and R2 are the same or different and independently represent hydrogen atom, alkyl, aryl, alkyloaryl, alkylcarbonyl, arylcarbonyl, while each of the above mentioned groups may be substituted in a chain or ring by amino, nitro or nitrile groups, R5(R6)R7-Si- group wherein R5, R6 and R7 are the same or different and denote C1-6alkyl or aryl, mono-, di- or oligosaccharide group while at least one hydroxyl group of saccharide group may be substituted by the same or different acyl, alkyl, acyloxyalkyl or aryl groups; R3 represents hydrogen atom or -COCH3 group; and R4 represents hydrogen atom, -SO3H, SO3 or -NH2 or -NO2 group; and their pharmaceutically acceptable salts exhibit antyproliferative and antitumour activity. New derivatives and pharmaceutical preparations containing them may be suitable in clinical oncology and/or chemoprevention of neoplasms.