A US radio station claims to have discovered the holy grail of soft drinks -- the secret recipe for Coca-Cola, news.com.au reported Tuesday.

The website for Chicago public radio show This American Life states it found a list of ingredients for Coca-Cola, a secret that has been closely guarded for more than a century, in a 40-year-old newspaper.

It said the Atlanta Journal-Constitution published a photo of a book containing a hand-written replica of the original recipe in 1979.

The recipe, which supposedly can only be mixed by two Coca-Cola executives in the world, reportedly contains the exact measures of all the different oils needed for the drink's secret ingredient, "Merchandise 7X."

Despite making up only one percent of the drink's total formula, Merchandise 7X is what provides the unique taste. According to the recipe replica, it consists of alcohol, orange oil, lemon oil, nutmeg oil, coriander, neroli and cinnamon.

The recipe is said to be similar to previous lists made by those who have tried to uncover the secret ingredients, including Mark Pendegrast, the US author of "For God, Country and Coca-Cola," and Joe Jacobs, owner of the pharmacy where Coca-Cola was first served.

Rumored to be guarded 24 hours a day in a vault, the official Coca-Cola recipe has been one of the most closely kept trade secrets since the popular soft drink was concocted by medicinal chemist John Pemberton in 1886.

Coca-Cola refused to comment Tuesday on whether the secret formula had been divulged, with a spokeswoman making the following statement:

"The ingredients used in our beverages are listed on the product labels and many people have tried over time to crack the secret formula of Coca-Cola. That secret combination of ingredients holds a special place in the history and mythology of Coca-Cola -- something we continue to celebrate as we mark our 125th anniversary this year."

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