2-[4-(polyhalo-2-hydroxy-2-propyl)anilino]-2-oxazolines are known as disclosed in copending application Ser. No. 668,385, filed Mar. 19, 1976, now U.S. Pat. No. 4,081,547 as useful agents for the treatment of hypertension. The art also discloses that substituted anilino-2-oxazolines have hypotensive activity, e.g., U.S. Pat. Nos. 3,453,284; 3,499,083; and 3,499,084; and Belgian Pat. Nos. 704,392; 704,393; and 704,396. However, these compounds lack the 4-one or 2-thiazolin-4-one functional group present in the compounds of this invention.