Purines are the larger of the two types of bases found in DNA. Cytosine and thymine are pyrimidines. The deoxyribose sugar of the DNA backbone has 5 carbons and 3 oxygens. The carbon atoms are numbered 1', 2', 3', 4', and 5' to distinguish from the numbering of the atoms of the purine and pyrmidine rings.
Be it a cola, non-cola, diet soda or other sugar-sweetened carbonated beverage, carbonated beverages can increase your risk of serious health issues. Soda, especially colas, contains high levels of phosphoric acid, which is closely linked with the development of kidney stones and other renal problems.
Artificial colors in soda and other food and drink do irritate the bladder and kidneys. Steer clear of them as much as you can. I have a bladder disease called interstitial cystitis. I also have to avoid caffeine -- also in Coke -- as it irritates my bladder as well.