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1. Acesulfame K
2. Acetamide
3. Acetaminophen
4. Acetic acid
5. Acetoaldehyde
6. Acetone
7. Acetophenone
8. Acetylcadaverine
9. Acrinathrin
10. Acrylamide
11. Acrylic acid
12. di-N-Acetylchitobiose
13. hexa-N-Acetyl-chitohexaose
14. N-Acetyl-chitooligosaccharides
15. penta-N-Acetyl-chitopentaose
16. tetra-N-Acetyl-chitotetraose
17. tri-N-Acetyl-chitotriose
18. Acetylcholine
19. N-Acetyl-D-glucosamine
20. N-Acetyl-D-galactosamine
21. N-Acetylneuraminic acid
22. N-Acetylprocainamide
23. Acetylputrescine
24. Acetylspermidine
25. Acetylspermine
26. α₁ Acid glycoprotein
27. trans-Aconitic acid
28. Adenine
29. Adenosine
30. Adenosin diphosphate, ADP
31. Adenosin monophosphate, AMP
32. Adenosine phosphate
33. Adenosine triphosphate, ATP
34. Adenylate kinase
35. Adipic acid
36. Adonitol
37. ADP, Adenosin diphosphate
38. Adrenal cortical hormone
39. Adrenaline, Epinephrine
40. Aflatoxin
41. Alanine, Ala
42. Alanine-β-naphthylamide
43. Ala-Phe
44. Ala-Tyr
45. Albumin
46. Aldicarb
47. Aldicarb sulfone
48. Aldolase
49. Aldosterone
50. Alkylamines
51. Allosamidin
52. Amides
53. Amiloride
54. γ-Aminobutyric acid, GABA
55. m-Aminonitrobenzene
56. Aminophenol
57. m-Aminophenylboronic acid
58. 2-Aminopyridine
59. Aminopyrine
60. Ammonia
61. Ammonium, NH₄⁺
62. Amoxicillin
63. AMP, Adenosin monophosphate
64. cAMP
65. Amphetamine
66. Ampicillin
67. Amylose
68. Androgen
69. 4-Androstene-3,17-dione
70. 5-Androstene-3β,17β-diol
71. Angiotensin �T
72. Aangiotensin �U
73. Angiotensin �V
74. Aniline
75. Anthracene
76. Antipyrine
77. Antitrypsin
78. Aprotinin
79. Apple juice
80. Arabinose
81. Arabitol
82. Arachidic acid, Eicosanoic acid
83. Arachidonic acid
84. Arginine, Arg
85. Arg-Pro-Lys-Pro
86. Arg-Asp
87. Arsenate, AsO₄^3-
88. Arsenite, AsO₂^-
89. Arsenic compounds
90. Arsenobetaine, AB
91. Arsinic acid, As(III)
92. Ascorbic acid, Vitamin C
93. Asn¹,Val⁵-Angiotensin �T
94. AsO₂^-, Arsenite
95. AsO₄^3-, Arsenate
96. Aspartic acid, Asp
97. Aspartame
98. Asp-Ser-Phe
99. Aspirin
100. Asulam
101. ATP, Adenosine triphosphate
102. Atropine
103. Avidin
104. Azide ion, N₃^-