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PST-900 is an investigational **small molecule** inhibitor of dual-specificity tyrosine-phosphorylation-regulated kinase 1A intended to modulate DYRK1A-driven biology. It was initially developed by Pharmasum Therapeutics as a targeted kinase inhibitor, but available information indicates that the program was **discontinued** before commercialization. Publicly available details on formulation, route, and disease-specific clinical development are limited.
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