The required benzothiophenecarboxylic acid precursor (IV) was prepared by Friedel-Crafts acylation of 5-(methylthio)indan (I) with 2-methylbenzoyl chloride (II) followed by condensation of the resulting mercapto ketone (III) with hot chloroacetic acid. Curtius rearrangement of carboxylic acid (IV) using diphenylphosphoryl azide produced isocyanate (V), which was subsequently condensed with 2,6-diethylaniline (VI) to yield the title urea.