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.
Coca-Cola with Lime
Coca Cola with Lime was briefly available in Australia, but proved quite unpopular with some larger retailers such as Woolworths and Coles, who bought in bulk, having to reduce the price considerably (50c for a 1.25 L bottle compared to around A$2 for all other varieties) in order to clear the product out. Diet Coke with Lime was discontinued in the United Kingdom, as was Diet Coke with Lemon in the beginning of 2007, having been renamed Diet Coke with Citrus Zest in 2007, which is mixture of lime and lemon taste.