Diet Coke
Diet Coke does not use a modified form of the Coca-Cola recipe, but instead an entirely different formula. The controversial New Coke, introduced in 1985, used a version of the Diet Coke recipe that contained high fructose corn syrup and had a slightly different balance of ingredients. In 2004, Coca-Cola introduced Coca-Cola C2, which it claims tastes much closer to Coca-Cola but contains half the carbohydrates. In 2005, the company introduced Coca-Cola Zero (replaced by "Coca-Cola Zero Sugar" in 2017), a sugar-free variation of regular Coca-Cola.
Citra (drink)
In 1998, Coke introduced a new drink in the US market also called Citra which was later renamed Fanta Citrus. Although the brand name was similar, this was a totally different grapefruit-based formula. In February 2012, Coke announced that it was reviving the Citra brand in rural areas of Maharashtra and Gujarat on a pilot basis, on a price strategy that will be 20% cheaper than other Coke and competitor brands. The relaunch is aimed at competing with smaller regional brands.