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SCHOENING, A., & FRIEDRICHSEN, W. (1988). ChemInform Abstract: Intramolecular Cycloaddition Reactions with Isobenzofurans. Part 3. A Hydrogenated Naphtho(2,1-b)thiophene from a 1-Alkenylthieno(2,3-c)furan. ChemInform, 19(33). doi:10.1002/chin.198833163 
10.1002/chin.198833163