Discuss Bischer synthesis of indole. How can you obtain a single product in this reaction?

The Bischler synthesis of indole is a method for the construction of the indole ring system. It involves the cyclization of o-nitrobenzylamine derivatives to form indole under specific reaction conditions. The reaction starts with the treatment of o-nitrobenzylamine (aniline derivative) with a strong acid, _______ _______ _____ ___ ______ ________ ___ _________ _____ _________.
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