This invention relates to antiviral agents, in particular to salts useful in the treatment of infections caused by Picornaviridae, such as human rhinovirus (HRV) and methods for their preparation. The invention also relates to the use of these salts in the treatment of picornavirus infections. The salts of this invention are especially suitable for use in the treatment of HRV, however it is to be understood that the invention is also applicable to other viruses of the picornavirus family.
