1,3,4-Oxadiazol-2(3H)-one, 5-(3-chlorobenzo(b)thien-2-yl)- 3-Cdoob 3-Chloro-2-(2,3-dihydro-2-oxo-1,3,4-oxadiazol-5-yl)benzo(b)thiophene 5-(3-Chlorobenzo(b)thien-2-yl)-1,3,4-oxadiazol-2(3H)-one 78620-31-2