Vildagliptin is a recently released antidiabetic drug (J. Med. Chem. 2010, 7902). Circle and name each functional group in vildagliptin. 
Definitions:
Subclass
A specialized or derived class in object-oriented programming that inherits properties from a parent class.
Object-oriented Terms
Concepts and vocabulary associated with object-oriented programming, which focuses on objects rather than actions and data rather than logic.
SDLC Phase
A stage within the Software Development Life Cycle, including planning, design, development, testing, and maintenance.
Program Specifications
A detailed description of the objectives, functionalities, and constraints of a software program, serving as a guideline for development.
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Q20: Draw a chair conformation of the starting
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