A tetrapeptide consisting of N-decanoyl-L-arginine, L-valine, L-lysine, and L-arginine joined in sequence by peptide linkages and in which the carboxy group at the C-terminus is substituted by a chloroacetyl group. It is a furin inhibitor that has antiviral activity against Chikungunya virus, Zika virus and Japanese encephalitis virus. ChEBI: Decanoyl-L-Arg-L-Val-L-Lys-L-Arg-chloromethylketone is a tetrapeptide consisting of N-decanoyl-L-arginine, L-valine, L-lysine, and L-arginine joined in sequence by peptide linkages and in which the carboxy group at the C-terminus is substituted by a chloroacetyl group. It is a furin inhibitor that has antiviral activity against Chikungunya virus, Zika virus and Japanese encephalitis virus. It has a role as an antiviral agent, a peptidomimetic and an EC 3.4.21.75 (furin) inhibitor. It is a tetrapeptide and an organochlorine compound.