| Substanz | Abkürzung | Systematik | Provings |
| Nabalus albus Weißer Lattich White Lettuce |
Nabal-a | Asteraceae/ Compositae |
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| Nabalus serpentarius Weißer Lattich White Lettuce |
Nabal | Asteraceae/ Compositae |
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| Naja haje Ägyptische Kobra Egyptian cobra |
Naja-h | Elapidae |
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| Naja mossambica Speikobra Mozambique Spitting Cobra |
Naja-mo | Elapidae |
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| Naja tripudians Indische Kobra Cobra |
Naja | Elapidae |
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| Napellinum Napellin Napelline |
Napin | Ranunculaceae |
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| Naphthalinum Naphthalin Naphthalene |
Naphtin | Aromatic Carbon Compounds |
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| Naphthochinonum Naphthochinon Naphthoquinone |
Naphth | Aromatic Carbon Compounds |
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| Narceinum |
Narcin | Papaveraceae |
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