Title cpds of formula (I): (where Ar = phenyl, opt. subst. by Cl or F or by =1 1-4C alkyl or alkoxy gps. and R = H or 1-3C alkyl may be prepd. by the reaction of a 1-benzoyl ethyl-2-hydroxy methyl benzimidazole (II) with an isocyanate RNCO (III), or by reaction of a phenoxy carbonyl deriv. of (II) with an amine RNH2.
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