Identification of Predominant Functional Group

Consider the following organic compound represented by the structure:

In this compound, identify the major functional group present. Functional groups are specific groups of atoms within molecules that are responsible for the characteristic chemical reactions of those molecules.

Understanding the different functional groups is crucial for predicting the molecular behavior in biological systems. The functional groups to be considered include hydroxyl (-OH), carbonyl (C=O), amine (-NH₂), and carboxyl (-COOH). Which of these is predominant in the compound shown?