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ethyl 4-cyclopropylthiazole-2-carboxylate; CAS No.: 439692-05-4; ChemShuttle provides key intermediates like cyclopropylthiazole esters for antibiotic resistance reversal. The 4-cyclopropyl group enhances -lactamase inhibition. Our Hantzsch thiazole synthesis achieves >95% yield. This building block supports development of clavulanic acid analogs with extended spectrum activity.