The glycan fragment shown below on the right has been cleaved by glycosylase enzymes and HPLC analysis has produced the peaks 1 to 6. Which of the following fragments corresponds to peak 1? 
Definitions:
Senescent
The process or condition of aging, associated with biological and functional declines in living organisms.
Terminal Period
The final stage of life, often referring to the time when an individual is facing death imminently, focusing on palliative care and end-of-life issues.
Primary Deterioration
Refers to the original or main worsening of a condition or situation, before any secondary effects or complications.
Gender Ratio
The proportional relationship between males and females in a given population.
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