Arginine derivatives Asparagine derivatives Aspartic acid derivatives Cysteine derivatives Glutamine derivatives Glutamic acid derivatives Glycine derivative Histidine derivatives Isoleucine derivatives Leucine derivatives Lysine derivatives Methionine derivatives Phenylalanine derivatives Proline derivatives Serine derivatives Threonine derivatives Tryptophan derivatives Tyrosine derivatives Valine derivatives Alanine derivatives Methionine derivatives BOC-amino acid Cbz-amino acid FMOC-amino acid α-Amino acid Other Amino Acid Protection Amino alcohol derivative Amino acid salts Amino acid esters Other amino acid derivatives Natural amino acids and derivatives
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Amino Acids and Derivatives

Arginine derivatives Asparagine derivatives Aspartic acid derivatives Cysteine derivatives Glutamine derivatives Glutamic acid derivatives Glycine derivative Histidine derivatives Isoleucine derivatives Leucine derivatives Lysine derivatives Methionine derivatives Phenylalanine derivatives Proline derivatives Serine derivatives Threonine derivatives Tryptophan derivatives Tyrosine derivatives Valine derivatives Alanine derivatives Methionine derivatives BOC-amino acid Cbz-amino acid FMOC-amino acid α-Amino acid Other Amino Acid Protection Amino alcohol derivative Amino acid salts Amino acid esters Other amino acid derivatives Natural amino acids and derivatives
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Amino acids and their derivatives belong to a compound containing both amino group and carboxyl group. They are presented in both the form of free-state and bound-state in vivo. Free amino acids are distributed in all kinds of animal cells and body fluids with the bound amino acids being the mainly basic components of proteins and peptides.

Natural amino acids act as colorless crystalline materials with relatively high melting points being mostly above 200 ℃. They are usually soluble in water but insoluble in non-polar organic solvents. However, tyrosine and cystine are insoluble in water; proline and hydroxyl proline are soluble in ethanol and ether. All amino acids are soluble in strong acid and alkali solution.

According to the polar characterization of the R group of the side chain of the α-amino acid; those 20 common amino acids that constitute protein can be divided into four groups:
① Amino acids with R group being non-polar; There are 8 kinds in total, wherein five kinds have aliphatic side chains, namely alanine, leucine, isoleucine, valine and proline; two kinds are aromatic amino acids, phenylalanine and tryptophan; one kind belongs to sulfur-containing amino acid, namely methionine; amino acids belonging to this group have lower water solubility than polar R-group amino acid; proline is generally different with α-amino acid, it is formed through the substitution of one hydrogen atom of the amino acid with the side chains of the α- amino acid, belonging actually to imino acid.
② Amino acids with polar but non-charged R group; There are seven kinds in total, namely serine, threonine and tyrosine with R group having hydroxy group; cysteine with R group having a mercapto group of cysteine; glutamine and asparagine with R-group containing amide group, another amino acid is glycine ; glycine molecule has no R group, but having certain polarity, and thus being classified into this group; the side chains in this group of amino acid contain unassociated polar groups and can form hydrogen bonds with water, and is easily soluble in water.
③Amino acids with R group being positively charged amino acids. There are three kinds in total, namely, lysine, arginine, and histidine; they carry positive charge at pH7.0 and are also known as alkaline amino acids.
④Amino acids with R group being negatively charged. There are two kinds in total, namely glutamate and aspartate; at pH7.0, the molecules are negatively charged, also known as acidic amino acids. The formula, abbreviations symbols and related constants of 20 kinds of amino acid structures can be seen from the table. In addition to the 20 common amino acids mentioned above, there are also diiodotyrosine, thyroxine, hydroxyproline and hydroxylysine existing in certain proteins. In addition to amino acids involved in protein composition, it has been also found of more than 200 kinds of other kinds amino acids in a variety of tissues and cells; these amino acids are mostly derivatives of those α- amino acid composition of proteins.

However, there are some β-, γ- or δ- amino acids and some amino acids belong to D-type amino acids such as [beta]-alanine, [gamma]-aminobutyric acid and the phenylalanine contained in the antibiotics gramicidin-S, the D-alanine and D-glutamate contained in Gram-positive bacteria cell wall. Some non-protein amino acids can act as metabolically important precursors or intermediates, wherein β-alanine is the precursors of vitamin pantothenic acid; ornithine, and citrulline are the precursors in the synthesis of arginine; [gamma]-aminobutyric acid is the chemical neurotransmitter. Plants contain a large amount of non-protein amino acids, belonging to plant secondary substances, such as theanine, canavanine, djenkolic acid, β- Cyanoalanine and so on.

In addition to 20 kinds of amino acids found in the body and animal protein products, it has been found of nearly 200 kinds of other kinds of amino acids in nature. Most of them have been discovered in the plant kingdom and have complex molecular structures with no relation with the protein metabolism. There have been less that have been seen in the animal kingdom with some of them being originated from the chemical modification of certain incorporated amino acids in the specific proteins, for example, the proline and lysine contained in collagen protein are often partially subject to re-hydroxylation of hydroxyproline and hydroxylysine; Another example is that there are often a small amount of lysine and histidine contained in actin and myosin protein containing hypermethylated εN methyl-lysine and 3N-histidine; it has been also found in the histone protein that the ∈ amino group contained in lysine is acetylated and the OH group in the serine is phosphorylated; thyroglobulin contains iodinated tyrosine and thyronine iodide; The heavy chain of τ myosin and the N-terminal of certain proteins contain pyroglutamate formed by glutamine; there also exists the cystine constituting of two cysteine molecules in the general protein.

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Structure:
Chemical Name:
D-2-Amino-4-pentenoic acid
CAS:
54594-06-8
MF:
C5H9NO2
Structure:
Chemical Name:
L-Glutamic acid dimethyl ester hydrochloride
CAS:
23150-65-4
MF:
C7H14ClNO4
Structure:
Chemical Name:
2-Amino-5-methylbenzoic acid
CAS:
2941-78-8
MF:
C8H9NO2
Structure:
Chemical Name:
FMOC-3-NITRO-L-TYROSINE
CAS:
136590-09-5
MF:
C24H20N2O7
Structure:
Chemical Name:
5-FLUORO-DL-TRYPTOPHAN
CAS:
154-08-5
MF:
C11H11FN2O2
Structure:
Chemical Name:
N-(2-Bromobenzyloxycarbonyloxy)succinimide
CAS:
128611-93-8
MF:
C12H10BrNO5
Structure:
Chemical Name:
BOC-HIS(BOC)-OH DCHA
CAS:
31687-58-8
MF:
C28H48N4O6
Structure:
Chemical Name:
(S)-1-Boc-piperidine-2-carboxylic acid
CAS:
26250-84-0
MF:
C11H19NO4
Structure:
Chemical Name:
Z-ASP-OME
CAS:
4668-42-2
MF:
C13H15NO6
Structure:
Chemical Name:
5-AMINO-2-BROMOBENZOIC ACID
CAS:
2840-02-0
MF:
C7H6BrNO2
Structure:
Chemical Name:
Ethyl L-tyrosinate
CAS:
949-67-7
MF:
C11H15NO3
Structure:
Chemical Name:
N-(3-Indolylacetyl)-L-phenylalanine
CAS:
57105-50-7
MF:
C19H18N2O3
Structure:
Chemical Name:
3-Aminocyclohexanecarboxylic acid
CAS:
25912-50-9
MF:
C7H13NO2
Structure:
Chemical Name:
3-FLUORO-D-PHENYLALANINE
CAS:
110117-84-5
MF:
C9H10FNO2
Structure:
Chemical Name:
β-Alanine
CAS:
107-95-9
MF:
C3 H7 N O2
Structure:
Chemical Name:
Boc-S-(4-methylbenzyl)-L-cysteine
CAS:
61925-77-7
MF:
C16H23NO4S
Structure:
Chemical Name:
3,5-DIAMINOBENZOIC ACID DIHYDROCHLORIDE
CAS:
618-56-4
MF:
C7H10Cl2N2O2
Structure:
Chemical Name:
N-Formylglycine
CAS:
2491-15-8
MF:
C3H5NO3
Structure:
Chemical Name:
FMOC-D-4-Trifluoromethylphe
CAS:
238742-88-6
MF:
C25H20F3NO4
Structure:
Chemical Name:
2-Methylphenyl-D-alanine
CAS:
80126-54-1
MF:
C10H13NO2
Structure:
Chemical Name:
Ethyl L-valinate hydrochloride
CAS:
17609-47-1
MF:
C7H16ClNO2
Structure:
Chemical Name:
N-Benzyloxycarbonyl-L-proline
CAS:
1148-11-4
MF:
C13H15NO4
Structure:
Chemical Name:
BOC-4-Methyl-D-phenylalanine
CAS:
80102-27-8
MF:
C15H21NO4
Structure:
Chemical Name:
N-T-BUTYLGLYCINE HCL
CAS:
6939-23-7
MF:
C6H14ClNO2
Structure:
Chemical Name:
Fmoc-L-Glutamic acid 1-tert-butyl ester
CAS:
84793-07-7
MF:
C24H27NO6
Structure:
Chemical Name:
FMOC-Ala-OH
CAS:
35661-39-3
MF:
C18H17NO4
Structure:
Chemical Name:
BOC-D-Phenylalanine
CAS:
18942-49-9
MF:
C14H19NO4
Structure:
Chemical Name:
N-(2-Hydroxyethyl)-N-methylaniline
CAS:
93-90-3
MF:
C9H13NO
Structure:
Chemical Name:
Sodium L-aspartate
CAS:
3792-50-5
MF:
C4H5NNa2O4
Structure:
Chemical Name:
1-(Boc-amino)cyclopropanecarboxylic acid
CAS:
88950-64-5
MF:
C9H15NO4
Structure:
Chemical Name:
BOC-(R)-3-AMINO-4-(4-CYANO-PHENYL)-BUTYRIC ACID
CAS:
269726-86-5
MF:
C16H20N2O4
Structure:
Chemical Name:
6-AMINO-PYRIDAZINE-3-CARBOXYLIC ACID
CAS:
59772-58-6
MF:
C5H5N3O2
Structure:
Chemical Name:
Methyl L-threoninate hydrochloride
CAS:
39994-75-7
MF:
C5H12ClNO3
Structure:
Chemical Name:
Boc-O-tert-butyl-L-tyrosine
CAS:
47375-34-8
MF:
C18H27NO5
Structure:
Chemical Name:
GLYCYL-L-PHENYLALANINE
CAS:
3321-03-7
MF:
C11H14N2O3
Structure:
Chemical Name:
(S)-3-AMINO-3-(4-FLUORO-PHENYL)-PROPIONIC ACID
CAS:
151911-33-0
MF:
C9H10FNO2
Structure:
Chemical Name:
2-Amino-5-chloro-3-methylbenzoic acid
CAS:
20776-67-4
MF:
C8H8ClNO2
Structure:
Chemical Name:
N-Cbz-L-Leucine
CAS:
2018-66-8
MF:
C14H19NO4
Structure:
Chemical Name:
BOC-L-LEUCINOL
CAS:
82010-31-9
MF:
C11H23NO3
Structure:
Chemical Name:
L-Threoninol
CAS:
3228-51-1
MF:
C4H11NO2
Structure:
Chemical Name:
O-Phospho-L-serine
CAS:
407-41-0
MF:
C3H8NO6P
Structure:
Chemical Name:
Boc-D-Serine
CAS:
6368-20-3
MF:
C8H15NO5
Structure:
Chemical Name:
D-LEUCYL-L-TYROSINE
CAS:
3303-29-5
MF:
C15H22N2O4
Structure:
Chemical Name:
FMOC-D-SER-OH
CAS:
116861-26-8
MF:
C18H17NO5
Structure:
Chemical Name:
O-BENZYL-D-SERINE
CAS:
10433-52-0
MF:
C10H13NO3
Structure:
Chemical Name:
BOC-L-1,2,3,4-TETRAHYDRONORHARMAN-3-CARBOXYLIC ACID
CAS:
66863-43-2
MF:
C17H20N2O4
Structure:
Chemical Name:
Fmoc-D-Me-Ala-OH
CAS:
138774-92-2
MF:
C19H19NO4
Structure:
Chemical Name:
3-(Dimethylamino)benzoic acid
CAS:
99-64-9
MF:
C9H11NO2
Structure:
Chemical Name:
N-BOC-D/L-PHENYLALANINOL
CAS:
145149-48-0
MF:
C14H21NO3
Structure:
Chemical Name:
L-Canavanine sulfate
CAS:
2219-31-0
MF:
C5H14N4O7S
Structure:
Chemical Name:
(R)-N-Fmoc-(3-Pyridyl)alanine
CAS:
142994-45-4
MF:
C23H20N2O4
Structure:
Chemical Name:
2-(ISOPROPYLAMINO)ETHANOL
CAS:
109-56-8
MF:
C5H13NO
Structure:
Chemical Name:
L-Homophenylalanine ethyl ester hydrochloride
CAS:
90891-21-7
MF:
C12H18ClNO2
Structure:
Chemical Name:
L(-)-Thiazolidine-4-carboxylic acid
CAS:
34592-47-7
MF:
C4H7NO2S
Structure:
Chemical Name:
H-D-GLU(OTBU)-OH
CAS:
45125-00-6
MF:
C9H17NO4
Structure:
Chemical Name:
2-Amino-5-chlorobenzoic acid
CAS:
635-21-2
MF:
C7H6ClNO2
Structure:
Chemical Name:
5-Hydroxytryptophan
CAS:
56-69-9
MF:
C11H12N2O3
Structure:
Chemical Name:
2-Aminonicotinic acid
CAS:
5345-47-1
MF:
C6H6N2O2
Structure:
Chemical Name:
(R)-N-Boc-piperazine-2-carboxylic acid methyl ester
CAS:
252990-05-9
MF:
C11H20N2O4
Structure:
Chemical Name:
Boc-L-Glutamic acid 1-benzyl ester
CAS:
30924-93-7
MF:
C17H23NO6
Structure:
Chemical Name:
D-2,4-DICHLOROPHENYLALANINE
CAS:
114872-98-9
MF:
C9H9Cl2NO2
Structure:
Chemical Name:
Boc-Aib-OH
CAS:
30992-29-1
MF:
C9H17NO4
Structure:
Chemical Name:
BOC-D-ASP(OBZL)-OH
CAS:
92828-64-3
MF:
C16H21NO6
Structure:
Chemical Name:
N-BOC-3-IODO-L-ALANINE BENZYL ESTER
CAS:
108957-20-6
MF:
C15H20INO4
Structure:
Chemical Name:
(R)-N-BOC-Propargylglycine
CAS:
63039-46-3
MF:
C10H15NO4
Structure:
Chemical Name:
Cbz-D-Valine
CAS:
1685-33-2
MF:
C13H17NO4
Structure:
Chemical Name:
N-Benzylglycine
CAS:
17136-36-6
MF:
C9H11NO2
Structure:
Chemical Name:
3-(3-Hydroxyphenyl)-DL-alanine
CAS:
775-06-4
MF:
C9H11NO3
Structure:
Chemical Name:
Fmoc-O-Phospho-L-tyrosine
CAS:
147762-53-6
MF:
C24H22NO8P
Structure:
Chemical Name:
Fmoc-THr(Bzl)-OH
CAS:
117872-75-0
MF:
C26H25NO5
Structure:
Chemical Name:
DL-ALANYL-DL-PHENYLALANINE
CAS:
1999-45-7
MF:
C12H16N2O3
Structure:
Chemical Name:
(R)-N-BOC-4-Bromophenylalanine
CAS:
79561-82-3
MF:
C14H18BrNO4
Structure:
Chemical Name:
Boc-L-2-allylglycine dicyclohexylamine salt
CAS:
143979-15-1
MF:
C22H40N2O4
Structure:
Chemical Name:
N-P-TOSYLGLYCINE
CAS:
1080-44-0
MF:
C9H11NO4S
Structure:
Chemical Name:
Methyl DL-2-aminopropanoate hydrochloride
CAS:
13515-97-4
MF:
C4H10ClNO2
Structure:
Chemical Name:
N-Cbz-O-tert-butyl-L-serine
CAS:
1676-75-1
MF:
C15H21NO5
Structure:
Chemical Name:
BOC-L-4-Nitrophe
CAS:
33305-77-0
MF:
C14H18N2O6
Structure:
Chemical Name:
BOC-(R)-3-AMINO-5-PHENYLPENTANOIC ACID
CAS:
218608-83-4
MF:
C16H23NO4
Structure:
Chemical Name:
BOC-D-Alanine
CAS:
7764-95-6
MF:
C8H15NO4
Structure:
Chemical Name:
Methyl 2-aminothiophene-3-carboxylate
CAS:
4651-81-4
MF:
C6H7NO2S
Structure:
Chemical Name:
N-Fmoc-N'-tosyl-L-arginine
CAS:
83792-47-6
MF:
C28H30N4O6S
Structure:
Chemical Name:
Ethyl L-phenylalaninate hydrochloride
CAS:
3182-93-2
MF:
C11H16ClNO2
Structure:
Chemical Name:
N-Carbobenzyloxy-L-aspartic acid
CAS:
1152-61-0
MF:
C12H13NO6
Structure:
Chemical Name:
FMOC-D-2-PYRIDYLALANINE
CAS:
185379-39-9
MF:
C23H20N2O4
Structure:
Chemical Name:
N-Boc-L-Histidine
CAS:
17791-52-5
MF:
C11H17N3O4
Structure:
Chemical Name:
(R)-(+)-alpha,alpha-Diphenyl-2-pyrrolidinemethanol
CAS:
22348-32-9
MF:
C17H19NO
Structure:
Chemical Name:
FMOC-L-2-BROMOPHENYLALANINE
CAS:
220497-47-2
MF:
C24H20BrNO4
Structure:
Chemical Name:
O-Benzyl-L-tyrosine methyl ester hydrochloride
CAS:
34805-17-9
MF:
C17H20ClNO3
Structure:
Chemical Name:
N-Cbz-D-glutamic acid alpha-benzyl ester
CAS:
65706-99-2
MF:
C20H21NO6
Structure:
Chemical Name:
AC-HIS-OH H2O
CAS:
39145-52-3
MF:
C8H13N3O4
Structure:
Chemical Name:
Nepsilon-Fmoc-Nalpha-Cbz-L-Lysine
CAS:
86060-82-4
MF:
C29H30N2O6
Structure:
Chemical Name:
Boc-N'-Nitro-L-homoarginine
CAS:
28968-64-1
MF:
C12H23N5O6
Structure:
Chemical Name:
L-3,4-DIFLUOROPHENYLALANINE
CAS:
31105-90-5
MF:
C9H9F2NO2
Structure:
Chemical Name:
BOC-(S)-3-AMINO-4-(2-NAPHTHYL)-BUTYRIC ACID
CAS:
219297-11-7
MF:
C19H23NO4
Structure:
Chemical Name:
Fmoc-N-methyl-L-isoleucine
CAS:
138775-22-1
MF:
C22H25NO4
Structure:
Chemical Name:
3-(3-Pyridyl)-D-alanine
CAS:
70702-47-5
MF:
C8H10N2O2
Structure:
Chemical Name:
L-Arginine-L-pyroglutamate
CAS:
56265-06-6
MF:
C11H21N5O5
Structure:
Chemical Name:
HBTU
CAS:
94790-37-1
MF:
C11H16F6N5OP
Structure:
Chemical Name:
N-Acetyl-L-glutamine
CAS:
35305-74-9
MF:
C7H12N2O4
Structure:
Chemical Name:
N-(4-Aminobenzoyl)-beta-alanine
CAS:
7377-08-4
MF:
C10H12N2O3