Compound can be prepared in two different ways both starting from sodium 1,4-methano-1,2,3,4-tetrahydro-6-naphthoxide (I): 1) The reaction of (I) with thiophosgene in chloroform gives O-(1,4-methano-1,2,3,4-tetrahydro-6-naphthyl)chlorothioformiate (II), n(20 C)(D) = 1.5930, which is then condensed with N-methyl-m-toluidine in the same solvent. 2) The condensation of (I) with N-methyl-N-(m-tolyl)thiocarbamoyl chloride (III) in acetone.