Carbonated water, coloring E-150d, sweeteners: sodium cyclamate, acesulfame K and aspartame, acidulants: phosphoric acid and citric acid and natural flavors (including caffeine). Contains a source of phenylalanine.
Other mandatory mentions on the label:
Sugar-free. Calorie-free. With sweeteners. Contains a source of phenylalanine. Light: Sugar-free.