Archiv der Pharmazie p. 631 - 635 (1994)
Update date:2022-07-29
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Theophylline derivatives with several groups linked at the 7-position were synthesized and their pharmacological activities were studied on guinea pig. Relaxant action in the tracheal muscle was increased in comparison with that of theophylline when the 3(2H)-pyridazinone system was linked to 7-(2-ethyl)-theophylline through the piperazine ring, but decreased when the 7-(2-ethyl)-theophylline was linked to 3(2H)-pyridazinone ring through an amino group.
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Doi:10.1071/CH9902045
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(1996)Doi:10.1016/j.tet.2015.11.008
(2016)Doi:10.1021/jo00104a049
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