Answer
It is an L- amino acid.
Work Step by Step
First rotate the original structure of citrulline as shown in the attached file below so that the carboxyl group appears at the top of the structure, and the amide group at the bottom.
Lehninger Principles of Biochemistry 6th Edition
by Nelson, David L.; Cox, Michael M.
Published by
W.H. Freeman
ISBN 10:
1-42923-414-8
ISBN 13:
978-1-42923-414-6
Chapter 3 - Amino Acids, Peptides, and Proteins - Problems - Page 110: 1
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