Effect on <i>K</i><sub>ATP</sub> Channel Activation Properties and Tissue Selectivity of the Nature of the Substituent in the 7- and the 3-Position of 4<i>H</i>-1,2,4-Benzothiadiazine 1,1-Dioxides
structurally related to previously described potassiumchannel openers such as the benzothiadiazine dioxide BPDZ 73, were tested as putative K(ATP) channelactivators on the pancreatic endocrine tissue and on the vascular smooth muscle tissue. The nature of the substituent introduced in the 7-position as well as the nature of the alkylamino side chain in the 3-position strongly affected both potency and tissue