The recipe:

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

via TIME.