A

1. Acarbose
2. Acesulfame K
3. Acetamide
4. Acetaminophen
5. Acetamiprid
6. Acetic acid
7. Acetoaldehyde
8. Acetone
9. Acetophenone
10. Acetylcadaverine
11. Acrylamide
12. Acrylic acid
13. di-N-Acetyl-chitobiose
14. hexa-N-Acetyl-chitohexaose
15. N-Acetyl-chitooligosaccharides
16. penta-N-Acetyl-chitopentaose
17. tetra-N-Acetyl-chitotetraose
18. tri-N-Acetyl-chitotriose
19. Acetylcholine
20. N-Acetyl-D-glucosamine
21. N-Acetyl-D-galactosamine
22. N-Acetylneuraminic acid
23. N-Acetylprocainamide
24. Acetylputrescine
25. Acetylspermidine
26. Acetylspermine
27. alpha₁ Acid glycoprotein
28. trans-Aconitic acid
29. Acrinathrin
30. Adenine
31. Adenosine
32. Adenosine diphosphate, ADP
33. Adenosine monophosphate, AMP
34. Adenosine phosphate
35. Adenosine triphosphate, ATP
36. Adenylate kinase
37. Adipic acid
38. Adonitol
39. ADP, Adenosine diphosphate
40. Adrenal cortical hormone
41. Adrenaline, Epinephrine
42. Aflatoxin
43. Alanine
44. Alanine-beta-naphthylamide
45. Ala-Phe
46. Ala-Tyr
47. Albumin
48. Albumin, BSA
49. Aldicarb
50. Aldicarb sulfone
51. Aldolase
52. Aldosterone
53. Alendronic acid
54. Alkylamine
55. Allosamidin
56. Allose
57. Amaranth, Food Red No.2
58. Amide
59. Amiloride
60. gamma-Aminobutyric acid, GABA
61. m-Aminonitrobenzene
62. Aminophenol
63. m-Aminophenylboronic acid
64. 2-Aminopyridine
65. Aminopyrine
66. Ammonia
67. Ammonium, NH₄⁺
68. Amoxicillin
69. AMP, Adenosine monophosphate
70. cAMP
71. Amphetamine
72. Ampicillin
73. Amylose
74. Androgen
75. 4-Androstene-3,17-dione
76. 5-Androstene-3beta,17beta-diol
77. Angiotensin I
78. Angiotensin II
79. Angiotensin III
80. Aniline
81. Anthracene
82. Antipyrine
83. Antitrypsin
84. Aprotinin
85. Apple juice
86. Arabinose
87. Arabitol
88. Arachidic acid, Eicosanoic acid
89. Arachidonic acid
90. Arginine
91. Arg-Pro-Lys-Pro
92. Arg-Asp
93. Arsenate, AsO₄^3-
94. Arsenite, AsO₂^-
95. Arsenic acid, As(V)
96. Arsenic compound
97. Arsenobetaine, AB
98. Arsinic acid, As(III)
99. Ascorbic acid, Vitamin C
100. Asn¹,Val⁵-Angiotensin I
101. AsO₂^-, Arsenite
102. AsO₄^3-, Arsenate
103. Aspartic acid
104. Aspartame
105. Asp-Ser-Phe
106. Aspirin
107. Asulam
108. ATP, Adenosine triphosphate
109. Atropine
110. Avidin
111. Azide, N₃^-
112. Azithromycin
113. Azorubine