a catalyst that is in a different phase from the reactants, often used to facilitate chemical reactions
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(3Z)-3-[2-(morpholin-4-yl)-4-oxo-1,3-thiazol-5(4H)-ylidene]-1,3-dihydro-2H-indol-2-one
ethyl 1-(4-fluorophenyl)-4-((4-fluorophenyl)amino)-5-oxo-2,5-dihydro-1H-pyrrole-3-carboxylate