Amino Acids and Peptides

Amino Acids with Trivial Names
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It is often helpful to use trivial names in order to avoid cumbersome systematic or semisystematic names, particularly if the substance has to be named frequently. Coining of trivial names is treated in 3AA-2.1, and a number of existing trivial names are listed in the appendices to the previous edition of recommendations on amino-acid nomenclature [6]; only the commoner are listed here.

Trivial name	Symbol	Structure of substance or of derived ion in the form predominating at neutral pH
-Alanine	Ala	NH3+-CH2-CH2-COO-
Allysine	-	HCO-[CH2]3-CH(NH3+)COO-
Citrulline	Cit	NH2-CO-NH-[CH2]3-CH(NH3+)COO-
Cystathionine
Cysteic acid	Cya	-O3S-CH2-CH(NH3+)COO-
Cystine
Dopa	-
Homocysteine	Hcy	HS-CH2-CH2-CH(NH3+)COO-
Homoserine	Hse	HO-CH2-CH2-CH(NH3+)COO-
Homoserine lactone	Hsl
Lanthionine
Ornithine		NH3+-[CH2]3-CH(NH3+)COO-
5-Oxoproline	Glp
Sarcosine	Sar	CH3-NH2+-CH2-COO-
Selenocysteine	Sec	HSe-CH2-CH(NH3+)COO-
Thyronine	-
Thyroxine	Thx

Source: http://www.chem.qmul.ac.uk/iupac/AminoAcid/AAap.html