title: A synthetic approach to some tetrapyrranes.
mesh_terms: D002855:Chromatography, Thin Layer; D003460:Crystallization; D009682:Magnetic Resonance Spectroscopy; D013058:Mass Spectrometry; D008970:Molecular Weight; D011166:Porphyrins / Q000138:chemical synthesis*; D013053:Spectrophotometry; D013696:Temperature
chemical_list: D011166:Porphyrins