The present invention relates to an activated peptide derived from the CD4 receptor, which is capable of coupling by covalent bonding to an organic molecule and thus makes it possible to generate multiple potentially antiviral derivatives. The present invention also relates to a conjugated molecule comprising the CD4-receptor-derived peptide and an organic molecule, preferably the GPR1 peptide or a polyanion. Such a conjugated molecule can in particular be used in antiviral treatments, in particular the treatment of AIDS. The invention also relates to the methods for preparing the activated peptide derived from the CD4 receptor and the conjugated molecule.