“…Synthesis of compound 248 involves refluxing 2-benz[ c , d ]indolamine hydroiodide with 2-(methylthio)benz[ c , d ]indole-hydroiodide in 1,2-dichlorobenzene in presence of triethylamine, giving the amine 247 . Subsequent treatment with boron trifluoride etherate affords the desired product 248 (reaction 20) …”