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L-Thyroxine; (S)-2-amino-3-(4-(4-hydroxy-3,5-diiodophenoxy)-3,5-diiodophenyl)propanoic acid; CAS No.: 51-48-9; (S)-2-amino-3-(4-(4-hydroxy-3,5-diiodophenoxy)-3,5-diiodophenyl)propanoic acid (CAS 51-48-9) underscores ChemShuttle s role in key intermediates for iodinated thyroid hormone analogs. This diiodotyrosine derivative (CAS 51-48-9) serves as a key intermediate in radiopharmaceutical and diagnostic agent synthesis. As a Leading Chemicals Distributor, ChemShuttle provides CAS 51-48-9 with isotope purity documentation.