| 50976-02-8 | Dicyclopentadienyl acrylate | | 1 | | 2916.12 | | Send  | 113.49 | |
| 50984-52-6 | Fragrance of p-Anisaldehyde | 4-methoxybenzaldehyde | | ü | 3302.90 | | Send  | 54250.74 | |
| 51-03-6 | Piperonyl butoxide | 5-[2-(2-Butoxyethoxy)ethoxymethyl]-6-propyl-1,3-benzodioxole | 1 | | 2925.19 | 3 ; 8 | Send  | 24505233.04 | |
| 51-05-8 | Procaine hydrochloride | 2-(Diethylamino)ethyl 4-aminobenzoate;hydrochloride | 1 | | 2922.49 | | Send  | 205378.84 | |
| 51-15-0 | Pyridine-2-aldoxime methochloride | 2-Hydroxyiminomethyl-1-methylpyridinium chloride | 1 | | 2933.39 | | Send  | 2941.61 | |
| 51-17-2 | 1,3-Benzodiazole | 1H-Benzimidazole | 1 | | 2933.19 | | Send  | 2029480.47 | |
| 51-21-8 | 5-Fluorouracil | 2,4-Dihydroxy-5-fluoropyrimidine | 1 | | 2933.59 | 6 | Send  | 10963.84 | |
| 51-28-5 | 2,4-Dinitrophenol | 2,4-Dinitrophenol | 1 | | 2908.99 | 3 ; 8 | Send  | 152.20 | |
| 51-35-4 | Hydroxyproline ; Trans-4-hydroxy-L-proline | (4R)-4-Hydroxy-L-proline | 1 | | 2933.99 ; 3821.00 | | Send  | 16196.90 | |
| 51-41-2 | (R)-4-(2-Amino-1-hydroxyethyl)-1,2-benzenediol ; L-Noradrenaline | Norepinephrine | 1 | | 2914.70 | | Send  | 6426.05 | |