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The separations of eleven thiazide and related sulfonamide diuretics using superheated water chromatography at up to 200 °C on an XBridge C18 column were compared with conventional liquid chromatography at ambient temperature. Most of the sulfonamide diuretics were thermally stable, but many of the thiazides were degraded. The most sensitive were the dihydrothiazides, including cyclopenthiazide and...