The present invention relates to compounds of formula (I)its salts, isomers or prodrugs thereof useful in the treatment of viral infections, in particular respiratory syncytial virus (RSV) infections. The present invention also relates to processes for preparing the compounds and intermediates used in their preparation.本發明係關於一種式(I)之化合物:其鹽、其異構物或前藥體,其在治療病毒感染,特別是呼吸道融合性病毒(RSV)感染上有用。本發明亦關於一種用來製備該化合物及在其製備中所使用的中間物之方法。