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1. N₃^-, Azide ion
2. Na, Sodium
3. Naphthalene
4. Na₄P₂O₇, Sodium pyrophosphate
5. Na₅P₃O₁₀, Sodium tripolyphosphate
6. Nd, Neodymium
7. α-NED, β-EDP-Leu
8. Neodymium, Nd
9. β-NED, β-Neoendorphin
10. Nefopam
11. β-Neoendorphin, β-NED
12. Neurotensin
13. NH₄⁺, Ammonium
14. Ni²⁺, Nickel
15. Niacin, Nicotinic acid, Vitamin B₃
16. Niacinamide, Nicotinamide, Nicotinic acid amide
17. Nickel, Ni²⁺
18. Nicotinamide, Nicotinic acid amide, Niacinamide
19. Nicotinic acid, Niacin, Vitamin B₃
20. Nigerose
21. Nitrate, NO₃^-
22. Nitrilotriacetic acid, NTA
23. Nitrilotrismethylenephosphonate, NTPO
24. Nitrite, NO₂^-
25. Nitrobenzene
26. 4-Nitrophenol
27. p-Nitrophenyl-α-D-galactoside
28. p-Nitrophenyl-β-D-galactopyranoside
29. p-Nitrophenyl-β-D-glucopyranoside
30. p-Nitrophenyl-α-D-glucoside
31. p-Nitrophenyl-α-D-mannoside
32. Nivalenol, NIV
33. NO₂^-, Nitrite
34. NO₃^-, Nitrate
35. Nonmercaptoalbumin
36. Nonylphenol
37. Nonylphenxy acetic acid
38. Nonylphenol diethoxy acetic acid
39. Nonylphenol ethoxylate, Polyoxyethylene nonylphenyl ether
40. Nonylphenol monoethoxy acetic acid
41. Noradrenaline, Norepinephrine
42. Norepinephrine, Noradrenaline
43. Norlaudansoline
44. Norphenylphrine
45. NTA, Nitrilotriacetic acid
46. Nylon, Polyamide
47. Nylon6, Polycaprolactam
48. Nylon6/T, Polytrimethyl hexamethylene terephthalamide
49. Nylon6/6, Polyhexamethylene adipamide
50. Nylon6/9, Polyhexamethylene nonanediamide
51. Nylon6/10, Polyhexamethylene sebacamide
52. Nylon6/12, Polyhexamethylene dodecanediamide
53. Nylon11, Polyundecanoamide
54. Nylon12, Polylaurylactam
55. Nystose