title: 2-Carbethoxyindole derivatives. I. Synthesis of 8-alkoxy- and 8,9-benzo-3H-pyridazino(4,5-b) indol-4-ones.
mesh_terms: D007211:Indoles / Q000138:chemical synthesis*; D007259:Infrared Rays; D007659:Ketones / Q000138:chemical synthesis; D008722:Methods; D011724:Pyridazines / Q000138:chemical synthesis*; D013057:Spectrum Analysis
chemical_list: D007211:Indoles; D007659:Ketones; D011724:Pyridazines