Inhibition of Moloney leukaemia virus production by N-methylisatin-beta-4':4-diethylthiosemicarbazone.

N-methylisatin-beta-4':4'-diethylthiosemicarbazone (M-IBDET) inhibited the production of Moloney leukaemia virus (MLV). Virus inhibition was related to drug concentrations and time of treatment. The effective antiviral drug concentrations ranged between 3.