| http://www.w3.org/ns/prov#value | - nnose, xylose, lactose and higher polysaccharides. [0045] Advantageously the invention is related to a compound chosen in the group consisting of the porphyrin derivatives mentioned above wherein [0046] a) R5=R6=R7=R8=S-Sugar OH [0047] b) R5=R7=R8=S-Sugar OH and R6=F [0048] c) R6=R8=S-Sugar OH and R5=R7=F [0049] d) R7=R8=S-Sugar OH and R5=R6=F [0050] where Sugar is a mono or a polysaccharides, adv
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