Prepare a foam structure that includes hollow coalesced foam strands and, optionally, solid coalesced foam strands using an extrusion die block equipped with apertures that promote forming the hollow strands and, optionally, the solid foam strands.

 
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> 5-Fluoro-, Chloro-and Cyano-Pyridin-2-Yl-Tetrazoles as Ligands of the Metabotropic Glutamate Receptor-5

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