All L amino acids have an S absolute configuration except L-cysteine, which has the R configuration. L-cysteine is designated as having the R absolute configuration needs to be explained. Concept introduction: Amino acids are so named because they all are weak acids. All amino acids have at least two dissociable hydrogens, (diprotic), and some have three dissociable hydrogens and are triprotic.

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Chapter 2, Problem 32P

Interpretation Introduction

Interpretation:

All L amino acids have an S absolute configuration except L-cysteine, which has the R configuration. L-cysteine is designated as having the R absolute configuration needs to be explained.

Concept introduction:

Amino acids are so named because they all are weak acids. All amino acids have at least two dissociable hydrogens, (diprotic), and some have three dissociable hydrogens and are triprotic.

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