RJS308 is the PROTAC degrader for cyclosporin A (CypA) with a DC50 of 284 nM. RJS308 exhibits antiviral activcity through inhibition of HIV-1 and HCV replication[1]. (Pink: ligand for target protein CypA ligand-2 ; Black: linker (HY-W123015) ; Blue: ligand for E3 ligase VHL (S, R, S) -AHPC-Me (HY-112078) )