5‐chloro‐3‐methyl‐6‐(2‐bromopropionyl)‐2‐benzoxazolinone and substituted potasium dithiocarbamate derivatives. Their structures have been elucidated by UV‐, IR‐, and NMR‐spectra and by elemantary analysis. The title compounds have been assayed for their antispasmodic activity on guineapig ileum, they possess spezific anticholinergic properties.