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Various derivatives of the tetracyclic ring system 3//-Benzo[A]pyrazolo[3.4-A]1,6-naphthyridine were prepared from 4-anilino-l//-pyrazolo[3.4-Z>]pyridine-5carboxylic acids by intramolecular cyclization employing phophoryl chloride. Η NMR spectra of the various derivatives were recorder.

NEW TETRACYCLIC HETEROAROMATIC RING SYSTEM 3H-BENZO[b]PYRAZOLO[3,4-h]-1, 6-NAPHTHYRIDINES