Antiviral agents directed against respiratory syncytial virus

1. A method for treating an infection by respiratory syncytial virus (RSV), comprising administering to a subject an agent, wherein said agent is represented in formula (I):

wherein :

R1 and R2 are identical or different and are independently chosen among hydrogen, hydroxyl, halogen, haloalkyl, alkyl, aryl, arylalkyl, nitro, cyano, amino, alkoxy, alkoxyalkyl, heteroaryl, cycloalkyl and heterocyclyl; and

R3 and R4 are identical or different and are independently chosen among carboxylate, ester, substituted or non-substituted alkyloxycarbonyl, halogen, haloalkyl, alkyl, aryl, arylalkyl, nitro, cyano, amino, alkoxy, alkoxyalkyl, heteroaryl, cycloalkyl, heterocyclyl, boronate, phosphate, phosphonate, sulfinyl, sulfonyl, sulfonate, and sulfonamino, sulfonamido.

2. The method according to claim 1 , wherein R3 and R4 are identical and are both carboxylate.

3. The method according to claim 1 , wherein R1 and R2 are identical or different and are independently a halogen independently selected from the group consisting of: fluorine (F), chlorine (Cl), bromine (Br), and iodine (I).

4. The method according to claim 1 , wherein R1 and R2 are identical and are both hydrogen.

5. The method according to claim 1 , wherein R1 is fluorine and R2 is hydrogen.

6. The method according to claim 1 , wherein R1 is bromine and R2 is hydrogen.

7. The method according to claim 1 , wherein R1 is hydrogen and R2 is chlorine.

8. The method according to claim 1 , wherein R1 and R2 are identical and are both chlorine.

9. The method according to claim 1 , further comprising administering an antiviral agent with the agent of formula (I) as a combined preparation for simultaneous, separate or sequential, wherein said antiviral agent is selected from the group consisting of acyclovir, cidofovir, docosanol, famciclovir, foscarnet, fomivirsen, ganciclovir, idoxuridine, penciclovir, peramivir, trifluridine, valacyclovir, vidarabine, lamivudine, and ribavirin.