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5-Aminolevulinic acid (5-ALA) has been at the forefront of small molecule based fluorescence-guided tumor resection and photodynamic therapy. 5-ALA and two of its esters received marketing authorization but suffer from several major limitations, namely low stability and poor pharmacokinetic profile. Here, we present a new class of 5-ALA derivatives aiming at the stabilization of 5-ALA by incorporating...