Derivatives are synthesised of starting materials, usually polysaccharides, having sialic acid at the reducing terminal end, in which the reducing terminal unit is transformed into an aldehyde group. The system also includes a control module for generating a control signal for driving the bi-stable display from the current optical state to the final optical state. At least one region on the multi-touch surface is defined to display one or more user interface tools on the multi-touch surface. Hence, a user may control multiple management programs having respective command formats, by using a set of generic commands that are independent from the command formats, eliminating the necessity that the user needs to learn the detailed command formats and syntax.