| abstract |
A method of treating a proliferative disease in a vertebrate, the method comprising administering to the vertebrate a therapeutically effective amount of at least one compound of formula (I) (I) wherein R 1 is selected from H, C 1-6 alkyl, C 2-6 alkenyl and phenyl; R 2 is selected from H, C 1-6 alkyl, C 2-6 alkenyl and phenyl; wherein R 1 and R 2 are the same or different, or a salt, hydrate, or iron complex thereof, or a pharmaceutical composition comprising said compound, salt, hydrate or iron complex and a pharmaceutically acceptable carrier, diluent or excipient. |