The present invention relates to 2-pyran-4-one derivatives of general formula 1processes for their preparation, pharmaceutical compositions containing them, and their medical uses. Initially, the method has a list of already received one or more fill-paths defining a current linear blend, and a newly received fill-path, where the fill-paths each comprise a single colored parallelogram. A process fro recovering -glucan from an aqueous solution of -glucan comprising freezing the solution, allowing the solution to thaw and separating solids from the resultant suspension. At least one bottom aperture in the bottom panel is for at least partially receiving a container of the plurality of containers. The direction in which a single switch is operated becomes two ways, and therefore two control functions for a control apparatus can be controlled with a single switch, thus making it possible to make an individual switch multifunctional.