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Ethyl (S)-4-chloro-3-hydroxybutanoate; CAS No.: 86728-85-0; ChemShuttle s key intermediates include this ethyl 4-chloro-3-hydroxybutanoate, a chiral synthon for -blocker production. The (S)-configuration is achieved via enzymatic resolution with >99% ee. Our lipase-mediated transesterification process enables cost-effective large-scale production. The product serves as a versatile building block for cardiovascular drugs like atenolol and metoprolol.