compounds containing the 1,2,4-oxadiazol-5-one ring. For a series of 22 new derivatives of 3-aryl-4[(Z)-(1-methyl-2-alkylsulphanyl-vinyl)][1,2,4]oxadiazol-5(4H)-ones, which represent the “frozen” open chain counterpart of the cyclic aryl-thiazinooxadiazolones previously examined, we report here the synthesis and the characterization as LTCC blockers, evaluated on isolated tissues of guinea pig. The most