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(R)-2-((tert-butoxycarbonyl)amino)-3-(3,4-difluorophenyl)propanoic acid; CAS No.: 205445-51-8; (R)-2-((tert-Butoxycarbonyl)amino)-3-(3,4-difluorophenyl)propanoic acid, a Boc-protected derivative, is part of our heterocycles; various organic chemicals for inhaled drug formulations. The difluoro groups improve pulmonary absorption. ChemShuttle s small molecule synthesis optimizes azeotropic drying for moisture-sensitive intermediates.