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The reaction of fumaric acid with ammonium bicarbonate in water to form IDSA (presumably itaconic acid) is a complex process. Heating is likely needed for the reaction to proceed, but 50°C might not be sufficient. The cyclization step involves the formation of a five-membered ring, which requires a certain amount of energy. The specific temperature required will depend on factors like the concentration of reactants, the pH of the solution, and the presence of catalysts. A higher temperature may be needed to achieve a reasonable reaction rate and yield.