Synonyms: 2-Ethyl-5-(m-sulfophenyl)isoxazoliumhydroxide, inner salt (6CI,7CI); Isoxazolium, 2-ethyl-5-(3-sulfophenyl)-,hydroxide, inner salt; Isoxazolium, 2-ethyl-5-(m-sulfophenyl)-, hydroxide,inner salt (8CI); 2-Ethyl-5-phenylisoxazolium-3'-sulfonate;N-Ethyl-5-phenylisoxazolium-3'-sulfonate; NSC 82643; Reagents, Woodward's K;Woodward's Reagent K