Novel 2-(azetidin-2-on-1-yl)alkanedioic acid derivatives and 2-(azetidin-2-on-1-yl)alkoxyalkanoic acid derivatives are described for use in the treatment of disease states responsive to antagonism of the vasopressin V.sub.1a receptor ##STR00001##

 
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> Method of navigating medical devices in the presence of radiopaque material

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