Use the Following Paragraph to Answer to the Corresponding Questions)

question 11

Multiple Choice

Use the following paragraph to answer to the corresponding questions) .
Masatomo Kawakubo et al. reported in Science in August 2004 that the human stomach contains a natural, carbohydrate- base antibiotic that probably protects a large portion of the population from various diseases caused by the bacterium Helicobacter pylori. This bacterium has been linked to peptic ulcers, gastritis, and stomach cancer. This naturally occurring antibiotic is described by Kawakubo as having a terminal a1,4- linked N- acetylglucosamine NAG) , and it acts by inhibiting the biosynthesis of a major component of the cell wall in H. pylori. [: M. Kawakubo et al., Science 305 2004) : 1003.]
-Which of the following structures is most consistent with Kawakubo's description of this antibiotic?

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