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KU-55933; 2-morpholino-6-(thianthren-1-yl)-4H-pyran-4-one; CAS No.: 587871-26-9; ChemShuttle s morpholino-pyranone derivative serves as a PI3K inhibitor precursor. The thianthrenyl group enhances - interactions in kinase binding domains, while the morpholine improves aqueous solubility. Our custom synthesis includes fluorinated analogs for PET tracer development in oncology imaging.