A

1. Acesulfame K
2. Acetamide
3. Acetaminophen
4. Acetic acid
5. Acetoaldehyde
6. Acetone
7. Acetophenone
8. Acetylcadaverine
9. Acrylamide
10. Acrylic acid
11. di-N-Acetyl-chitobiose
12. hexa-N-Acetyl-chitohexaose
13. N-Acetyl-chitooligosaccharides
14. penta-N-Acetyl-chitopentaose
15. tetra-N-Acetyl-chitotetraose
16. tri-N-Acetyl-chitotriose
17. Acetylcholine
18. N-Acetyl-D-glucosamine
19. N-Acetyl-D-galactosamine
20. N-Acetylneuraminic acid
21. N-Acetylprocainamide
22. Acetylputrescine
23. Acetylspermidine
24. Acetylspermine
25. alpha₁ Acid glycoprotein
26. trans-Aconitic acid
27. Adenine
28. Adenosine
29. Adenosine diphosphate, ADP
30. Adenosine monophosphate, AMP
31. Adenosine phosphate
32. Adenosine triphosphate, ATP
33. Adenylate kinase
34. Adipic acid
35. Adonitol
36. ADP, Adenosine diphosphate
37. Adrenal cortical hormone
38. Adrenaline, Epinephrine
39. Aflatoxin
40. Alanine
41. Alanine-beta-naphthylamide
42. Ala-Phe
43. Ala-Tyr
44. Albumin
45. Albumin, BSA
46. Aldicarb
47. Aldicarb sulfone
48. Aldolase
49. Aldosterone
50. Alkylamine
51. Allosamidin
52. Amide
53. Amiloride
54. m-Aminonitrobenzene
55. Aminophenol
56. m-Aminophenylboronic acid
57. Aminopyrine
58. Ammonia
59. Ammonium, NH₄⁺
60. Amoxicillin
61. AMP, Adenosine monophosphate
62. cAMP
63. Amphetamine
64. Ampicillin
65. Amylose
66. Androgen
67. 4-Androstene-3,17-dione
68. 5-Androstene-3beta,17beta-diol
69. Angiotensin I
70. Angiotensin II
71. Angiotensin III
72. Aniline
73. Anthracene
74. Antipyrine
75. Antitrypsin
76. Aprotinin
77. Apple juice
78. Arabinose
79. Arabitol
80. Arachidic acid, Eicosanoic acid
81. Arachidonic acid
82. Arginine
83. Arg-Pro-Lys-Pro
84. Arg-Asp
85. Arsenate, AsO₄^3-
86. Arsenite, AsO₂^-
87. Arsenic compound
88. Arsenobetaine, AB
89. Arsinic acid, As(III)
90. Ascorbic acid, Vitamin C
91. Asn¹,Val⁵-Angiotensin I
92. AsO₂^-, Arsenite
93. AsO₄^3-, Arsenate
94. Aspartic acid
95. Aspartame
96. Asp-Ser-Phe
97. Aspirin
98. Asulam
99. ATP, Adenosine triphosphate
100. Atropine
101. Avidin
102. Azide ion, N₃^-