This American Life thinks it's uncovered one of the most closely guarded recipes in the whole world. You can find it right here.
Here, the formula for Coca-Cola Classic, complete with the ultra-secret "7X flavor" that makes Coke so unique:
Standard ingredients:
Fluid extract of Coca: 3 drams
USP?Citric acid: 3 oz
?Caffeine: 1 oz
?Sugar: 30 (unclear quantity)?
Water: 2.5 gal?
Lime juice: 2 pints, 1 quart?
Vanilla: 1 oz?
Caramel: 1.5 oz or more for color
The secret 7X flavor (use 2 oz of flavor to 5 gals syrup):?
Alcohol: 8 oz?
Orange oil: 20 drops?
Lemon oil: 30 drops
?Nutmeg oil: 10 drops
?Coriander: 5 drops
?Neroli: 10 drops
?Cinnamon: 10 drops
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This American Life has instructions about how to cook your own batch of Coca-Cola here. Make your own and avoid all the terrible corn syrup.