Although the drink is 99 percent sugar water, that other 1 percent is the key to the drink's unique taste. The tangy citrus flavors, from lime juice, citrus oils, and citric acid (today the citric acid has been replaced with phosphoric acid), was used by pharmacist John Pemberton to overcome the inherent unpleasant bitterness of cocaine and caffeine. Even after removing the cocaine from the drink, it was still necessary to conceal the ghastly flavor of kola nut and coca leaf extract from the taste buds with the sweet, tangy syrup.