| 1 | 519-02-8 | Matrine | C15H24N2O | 248.364 | | |
| 2 | 519-62-0 | chlorophyll B from spinach | C55H70MgN4O6 | 907.472 | | |
| 3 | 519-73-3 | Triphenylmethane | C19H16 | 244.33 | 90-94℃ | INSOLUBLE |
| 4 | 519-87-9 | N,N-Diphenylacetamide | C14H13NO | 211.259 | | |
| 5 | 519020-42-9 | 4-pyridazinemethanamine | C5H7N3 | 109.129 | | |
| 6 | 519032-08-7 | methyl 2-[1-[[(benzyloxy)carbonyl]amino]-1-methylethyl]-5,6-dihydroxypyrimidine-4-carboxylate | C17H19N3O6 | 361.349 | | |
| 7 | 519054-55-8 | 5-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)-1-benzofuran | C14H17BO3 | 244.094 | 65℃ | |
| 8 | 519055-62-0 | Tasisulam | C11H6BrCl2NO3S2 | 415.11 | | |
| 9 | 519056-67-8 | 1-methyl-3-(trifluoromethyl)-1H-pyrazole-4-sulfonyl chloride | C5H4ClF3N2O2S | 248.611 | | |
| 10 | 519059-09-7 | 3-cyano-4-fluorobenzeneacetonitrile | C9H5FN2 | 160.148 | | |
| 11 | 51908-64-6 | 4-Chloro-1-butyne | C4H5Cl | 88.5355 | | |
| 12 | 5191-97-9 | L-Ornithine Alpha-Ketoglutarate (1:1) Dihydrate | C5H12N2O2·C5H6O5 | 278.26 | | |
| 13 | 5192-03-0 | 5-Aminoindole | C8H8N2 | 132.163 | 130-134℃ | insoluble |
| 14 | 5192-04-1 | 7-Aminoindole | C8H8N2 | 132.163 | 96-100℃ | |
| 15 | 5192-23-4 | 4-Aminoindole | C8H8N2 | 132.163 | 106-109℃ | Insoluble |
| 16 | 51920-11-7 | 4-[(4-chloro-2-methoxyphenyl)azo]-N-(2,3-dihydro-2-oxo-1H-benzimidazol-5-yl)-3-hydroxynaphthalene-2-carboxamide | C25H18ClN5O4 | 487.895 | | |
| 17 | 51920-12-8 | pigment red 185 | C27H24N6O6S | 560.581 | 335-345℃ | |
| 18 | 5193-03-3 | (6-Chloro-2-pyridyl)hydrazine | C5H6ClN3 | 143.574 | | |
| 19 | 5193-84-0 | 4,6-dihydroxy-5-methoxypyrimidine | C5H6N2O3 | 142.113 | 341-345℃ | |
| 20 | 51933-77-8 | 3-bromo-2-(methylthio)pyridine | | | | |
| 21 | 51933-78-9 | 5-Bromo-2-(methylthio)pyridine | C6H6BrNS | 204.087 | 36-41℃ | |
| 22 | 51934-38-4 | 1-Naphthalenecarboxylicacid, 6-bromo- | C11H7BrO2 | | | |
| 23 | 51934-41-9 | Ethyl 4-iodobenzoate | C9H9IO2 | 276.071 | | insoluble |
| 24 | 51938-32-0 | 5,7-dihydroxy-2-(4-hydroxyphenyl)-6-[(2S,3R,4R,5S,6R)-3,4,5-trihydroxy-6-(hydroxymethyl)tetrahydro-2H-pyran-2-yl]-8-[(2S,3R,4S,5S)-3,4,5-trihydroxytetrahydro-2H-pyran-2-yl]-4H-chromen-4-one (non-preferred name) | C26H28O14 | 564.492 | | |
| 25 | 5194-32-1 | 2-Methylpyrimidine-5-carboxylic acid | C6H6N2O2 | 138.124 | | |
| 26 | 51940-44-4 | pipemidic acid | C14H17N5O3 | 303.316 | | |
| 27 | 51940-63-7 | 6-chloro-4-Pyrimidinecarboxylic acid ethyl ester | C7/H7ClN2O2 | 186.598 | | |
| 28 | 51940-64-8 | ethyl 2,4-dichloropyrimidine-5-carboxylate | C7H6Cl2N2O2 | 221.041 | | |
| 29 | 51942-84-8 | 3-(Methylsulfanyl)-5-oxo-2,5-dihydro-1,2,4-triazine-6-carboxylic acid | C5H5N3O3S | 187.176 | | |
| 30 | 51957-32-5 | 4-Chloro-5-methylpyrimidine | C5H5ClN2 | 128.56 | | |
| 31 | 51965-61-8 | p-Fluoro-ALPHA-methylphenylacetonitrile | C9H8FN | 149.165 | | |
| 32 | 5197-28-4 | 2-Bromo-4-nitroanisole | C7H6BrNO3 | 232.031 | 104-106℃ | |
| 33 | 5197-62-6 | 2-(2-(2-chloroethoxy)ethoxy)ethanol | C6H13ClO3 | 168.619 | | |
| 34 | 5197-87-5 | Benzyl Tripropyl Ammonium Chloride | C16H28ClN | 269.853 | 180℃ (dec.) | |
| 35 | 5197-95-5 | Benzyltriethylammonium bromide | C13H22BrN | 272.224 | 192-195℃ | soluble |
| 36 | 51977-21-0 | ethyl thiazolidine-4-carboxylate | C6H11NO2S | 161.222 | | |
| 37 | 5198-80-1 | 2-Bromo-4-fomylthiazole | C4H2BrNOS | 192.034 | | |
| 38 | 5198-87-8 | 2-Chloro-1,3-thiazole-4-carboxylic acid | C4H2ClNO2S | 163.582 | | |
| 39 | 5198-88-9 | 2-Bromo-4-thiazolecarboxylic acid | C4HBrNO2S | 207.026 | | |
| 40 | 51980-54-2 | 4-(1-Pyrrolidinyl)-benzaldehyde | C11H13NO | 175.227 | | |
| 41 | 51981-33-0 | 5-chloro-2-methyl-3-(3-sulphonatopropyl)benzoxazolium | C11H12ClNO4S | 289.735 | | |
| 42 | 51984-61-3 | 2-Methyl-5-nitro-3-pyridinamine | C6H7N3O2 | 153.139 | | |
| 43 | 51984-71-5 | Ethyl 2-methyl-5-nitro-3-pyridinecarboxylate | C9H10N2O4 | 210.187 | | |
| 44 | 51986-04-0 | ethyl 5-hydroxy-1-(tetrahydro-3-thienyl)-1H-pyrazole-3-carboxylate S,S-dioxide | C10H14N2O5S | 274.294 | | |
| 45 | 51986-17-5 | Ethyl 5-hydroxy-1-methyl-1H-pyrazole-3-carboxylate | C7H10N2O3 | 170.166 | | |
| 46 | 51987-73-6 | boc-L-phenylalanine methyl ester | C15H21NO4 | 279.332 | 36-40℃ | |
| 47 | 51997-51-4 | 4-(2,3-Epoxypropoxy)carbazole | C15H13NO2 | 239.269 | 130-132℃ | |