What is "bacchus-f"

Bacchus is a non-carbonated South Korean energy drink, first launched in 1963. It has been called Bacchus-F before a change in formula in the 1990s, after which it was known as Bacchus-D to note the increased amount of Taurine in the product (2000mg). Both formulas are manufactured by Dong-A Pharmaceutical Co., Ltd., part of the Dong-A Socio Group; and is also distributed in the United States under the Dong-A America Corporation in a 3.3 oz glass bottle (approximately 1/3 the size of a Red Bull).