Patent ID: 6881751

Claim:
A method of treating a cancerous disease sensitive to a compound of formula (I) wherein R 1 and R 2 are each independently of each other a straight-chain or branched alkyl residue having 1 to 30 carbon atoms, a straight-chain or branched alkenyl residue having 2 to 30 carbon atoms, a monocyclic or polycyclic alkyl residue having 3 to 30 carbon atoms, a monocyclic or polycyclic alkenyl residue having 4 to 30 carbon atoms, or a monocyclic or polycyclic aromatic residue having 6 to 30 carbon atoms, these residues being optionally substituted by one or several substituents, comprising administering a pharmaceutical preparation comprising a pharmaceutically effective amount of at least one compound of formula (I) to a human being or a mammal in need thereof in an amount effective to treat said cancerous disease.