BMS-433771 dihydrochloride hydrate is a potent orally active inhibitor of respiratory syncytial virus ( RSV ) . BMS-433771 dihydrochloride hydrate is active against both A and B groups of RSV , with an average EC 50 of 20 nM. BMS-433771 dihydrochloride hydrate can be used for the research of respiratory tract disease .