“… BMS-433771 ( 5 - 1 , Figure ), identified by scientists at Bristol-Myers Squib (BMS; New York, NY), was the first fusion inhibitor described with oral bioavailability . Subsequently the structurally distinct TMC-353121 ( 5 - 2 ; Johnson & Johnson, New Brunswick, NJ) progressed into nonhuman primate models of RSV infection, while the polycyclic fusion inhibitor BT-9881 ( 5 - 3 ) was evaluated in phase 1 clinical trials. , The discovery of BMS-433771 and TMC-353121 in particular have been reviewed in depth and provoked greater interest in the discovery of RSV fusion inhibitors. , The benzodiazepine urea RSV604 disclosed by Arrow Therapeutics was the only compound to achieve any sort of clinical proof of concept ( 5 - 4 , Figure ). …”