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The conformations of pyrrole derivatives (1, 2, 3a, b, 4a, b, 5, 6, and 7) have been elucidated from theoretical investigations, dipole moment measurements, use of stereospecific coupling through five bonds, as well as Overhauser experiments (6).

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structure structure (organic substances) K 9000 -043Conformation of Pyrrole Derivatives.-The conformations of the title compounds (I)-(VI) are elucidated from dipole moment measurements, Overhauser experiments, and theoretical investigations. -(OUSSAID, B.; HUBERT, C.; MOEINI, L.; GARRIGUES, B.; FAYET, J.-P.; Can. J. Chem.