| CAS编号 | 中文名 | 英文名 | 分子式 | 分子量 | 熔点 | 沸点 |
| 502964-52-5 | 硝基-grela | nitro-grela | | | | |
| 502964-53-6 | 氯(η2-p,c-三(2,4-二叔丁基苯基)亚磷酸)(三环己基膦)化钯(ii) | samcat | | | | |
| 50297-40-0 | 3-氯-n-(3-羟基苯基)丙酰胺 | 3-chloro-n-(3-hydroxyphenyl)propanamide | | | | |
| 50298-90-3 | 雪胆素乙 | curcubitacin iib | | | | |
| 50299-12-2 | | thr-leu | C10H20N2O4 | 232.27 | | |
| 50299-14-4 | | n-acetyl-dl-allylglycine | C7H11NO3 | 157.16 | | |
| 50299-42-8 | | h-3,5-dibromo-d-tyr-oh | CHBr2NO3 | 234.83 | | |
| 502990-49-0 | | 4-(butyl(phenyl)amino)benzaldehyde | | | | |
| 503-00-4 | | n,1,5-trimethyl-hexylamin | | | | |
| 503-01-5 | 异美丁 | n,1,5-trimethyl-4-hexenylamin | C9H10N | 141.25 | | |
| 503-05-9 | | 2-octyl-1-cyclopropene-1-heptanoic aci | | | | |
| 503-07-1 | | vernolic acid | | | | |
| 503-09-3 | | 1,2-epoxy-3-fluoro-propan | C3H5FO | 76.07 | | 85-86℃ |
| 503-11-7 | | glycidic acid | | | | |
| 503-17-3 | 2-丁炔 | 2-butyne | C4H6 | 54.09 | | 24℃ |
| 503-20-8 | 氟乙腈 | fluoro-acetonitril | C2H2FN | 59.04 | | |
| 503-27-5 | | Formaldehyde azine | C2H4N2 | 56.07 | | |
| 503-28-6 | | azomethane | C2H6N2 | 58.08 | | |
| 503-29-7 | 杂氮环丁烷 | azetidine | C3H7N | 57.09 | | 61-62℃ |
| 503-30-0 | | oxetane | C3H6O | 58.08 | | 50-50℃ |
| 503-31-1 | | 2H-Thiete | C3H4S | 72.13 | | |
| 503-34-4 | | trimethylallyl-ammoniu hydroxide | | | | |
| 503-38-8 | 氯甲酸三氯甲酯 | Carbonochloridic acid, trichloromethyl ester | C2Cl4O2 | 197.83 | -57-129℃ | 128℃ |
| 503-40-2 | | methanedisulfonic acid | | | | |
| 503-41-3 | | 1,3,2,4-dioxadithiane, 2,2,4,4-tetraoxide | | | | |
| 503-45-7 | | 3,3,5-trimethyl-cyclohexen | C9H16 | 124.22 | | |
| 503-47-9 | | 3,3-dimethyl-1-methylenecyclohexane | C9H16 | 124.22 | | |
| 503-48-0 | | mevalonolactone | | | | |
| 503-49-1 | | 3-hydroxy-3-methyl-glutaric aci | | | 105-108℃ | |
| 503-60-6 | 1-氯-3-甲基-2-丁烯 | 1-chloro-3-methyl-2-butene | C5H9Cl | 104.58 | | |
| 503-64-0 | | cis-but-2-enoic acid | C4H6O2 | 86.09 | | |
| 503-66-2 | 3-羟基丙酸 | 3-hydroxy-Propionic acid | C3H6O3 | 90.08 | | |
| 503-74-2 | 3-甲基丁酸 | 3-methyl-Butanoic acid | C5H10O2 | 102.13 | -26-177℃ | 176℃ |
| 503-76-4 | | 2-chloro-1-nitro-propane | C3H6ClNO2 | 123.54 | | |
| 503-80-0 | | oxybis(dimethyl-arsin | | | | |
| 503-83-3 | 1,5-二氢-4-羟基-2h-吡咯-2-酮 | 4-hydroxy-1h-pyrrol-2(5h)-one | | | | |
| 503-87-7 | 2-亚硫酰 | 2-thio-hydantoi | C3H4N2OS | 116.14 | 229-231℃ | |
| 503-88-8 | | 3,5-diamino-1,3,5-triazole | | | | |
| 503-89-9 | | 5-mercapto-4h-[1,2,4]triazol-3-ol | | | | |
| 503-93-5 | 2,6,6-三甲基-2,4-环庚二烯-1-酮 | 2,6,6-trimethyl-2,4-cycloheptadien-1-one | | | | |
| 5030-61-5 | 1,4-二甲氧基-2,3-二溴苯 | 2,3-dibromo-1,4-dimethoxybenzene | | | | |
| 5030-67-1 | | 2,5-dianilino-3,6-dichloro-1,4-benzoquinone | | | | |
| 503000-87-1 | 2-氯-6-甲氧基烟酸 | 2-chloro-6-methoxynicotinic acid | | | | |
| 50302-64-2 | | pyrazino(1',2':1,6)pyrido(3,4-b)indol-1(2h)-one, 3,4,6,7,12,12a-hexahydro-6-phe | | | | |
| 50302-65-3 | | (e)-(+-)-nyl | | | | |
| 50302-67-5 | | 2':1,6)pyrido(3,4-b)indole, 1,2,3,4,6,7,12,12a-octahydro-6-phenyl-pyrazino(1 | | | | |
| 50302-70-0 | | pyrazino(1',2':1,6)pyrido(3,4-b)indol-1(2h)-one, 3,4,6,7,12,12a-hexahydro-6-met | | | | |
| 50302-71-1 | | 2':1,6)pyrido(3,4-b)indole, 1,2,3,4,6,7,12,12a-octahydro-6-methyl-pyrazino(1 | | | | |
| 50302-72-2 | | butyrophenone, 4'-fluoro-4-(6-phenyl-1,2,3,4,6,7,12,12a-octahydropyrazino(1',2' | | | | |
| 50302-73-3 | | butyrophenone, 4'-fluoro-4-(6-methyl-1,2,3,4,6,7,12,12a-octahydropyrazino(1',2' | | | | |
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