Write a detailed note on biologically important sugar derivatives with suitable examples and draw their structures.

Sugar derivatives are crucial in biochemistry as they participate in a variety of biological processes, including cellular recognition, metabolism, and energy storage. These derivatives are formed when hydroxyl groups of sugars are chemically modified, often by substitution or addition of functional groups such as amino groups, phosphate groups, or sulfate groups. Below are some of the biologically important sugar derivatives with their examples and structures.

1. Amino Sugars:
   Amino sugars are sugars in which one or more hydroxyl groups are replaced by an amino group (-NH₂). The amino group often undergoes further modifications, such as acetylation, to form N-acetyl derivatives.
   - Glucosamine (C₆H₁₃NO₅) is an amino sugar where the hydroxyl group at the ____ ________ ______ ___ __________ __________ __________ _______ ______ __________ ___ _____.
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