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The direct synthesis of iminodisuccinic acid from succinamide and fumaric acid in methanol is unlikely. This reaction would likely require a catalyst and specific reaction conditions. Iminodisuccinic acid is a dicarboxylic acid derivative, and its synthesis typically involves reactions with amines or ammonia. For example, it can be prepared by reacting succinic anhydride with ammonia, followed by a dehydration step. You might consider alternative synthetic routes involving these starting materials and reaction conditions.