| 1 | 638-00-6 | 2,4-二甲基噻吩 | 2,4-Dimethylthiophene | C6H8S | 噻吩 | |
| 2 | 638-02-8 | 2,5-二甲基噻吩 | 2,5-Dimethylthiophene | C6H8S | 噻吩;化工;中间体;噻吩类;有机原料;医药中间体;噻吩类香料;精细化学品;有机化合物;化工原料-1 | |
| 3 | 638-03-9 | 间甲苯胺盐酸盐 | m-toluidinium chloride | C7H10ClN | 胺盐;化工试剂 | |
| 4 | 638-04-0 | 顺-1,3-二甲基环己烷 | cis-1,3-Dimethylcyclohexane | C8H16 | 烷烃 | |
| 5 | 638-07-3 | 4-氯乙酰乙酸乙酯 | 4-Chloroacetoacetic acid ethyl ester | C9H13NO2 | 酯;有机原料;有机酸酯;有机溶剂;医药原料;香精香料;工业原料;羰基化合物;医药中间体;化工中间体 | 医药中间体;农药中间体 |
| 6 | 638-08-4 | 硬脂酸酐 | stearic anhydride | C36H70O3 | 羧酸酐 | |
| 7 | 638-09-5 | 1,3,5-三氨基苯盐酸盐 | 1,3,5-TRIAMINOBENZENE TRIHYDROCHLORIDE | C6H12Cl3N3 | 合成材料中间体 | |
| 8 | 638-10-8 | 3-甲基-2-丁烯酸乙酯 | Ethyl-beta,beta-dimethyl acrylate | C7H12O2 | 酯;羰基化合物;医药中间体;有机化工原料;科研材料中间体 | |
| 9 | 638-11-9 | 丁酸异丙酯 | Isopropyl Butyrate | C7H14O2 | | |
| 10 | 638-13-1 | 6-甲基-4-硫代-3,4-二氢嘧啶-2(1H)-酮 | 4-Methyl-6-mercapto-2-pyrimidinol | C5H6N2OS | | |
| 11 | 638-14-2 | hexahydro-2,4,6-trimethyl-1,3,5-triazine | hexahydro-2,4,6-trimethyl-1,3,5-triazine | C6H15N3 | | |
| 12 | 638-16-4 | 三聚硫氰酸 | Trithiocyanuric acid | C3H3N3S3 | 三嗪;中间体;分析纯;生物化工;有机合成;有机砌块;有机原料;杂环砌块;特种橡胶助剂;铜矿的浮选药剂 | |
| 13 | 638-17-5 | (2α,4α,6α)-2,4,6-三甲基-4H-1,3,5-二噻嗪 | DIHYDRO-2,4,6-TRIMETHYL-1,3,5(4H)DITHIAZINE | C6H13NS2 | | |
| 14 | 638-18-6 | 3-羟基戊二酸 | 3-Hydroxyglutaric Acid | C5H8O5 | 化学试剂 | |
| 15 | 638-20-0 | N,N'-carbonylbis(acetamide) | N,N'-carbonylbis(acetamide) | C5H8N2O3 | | |
| 16 | 638-21-1 | 苯膦 | Phenylphosphine | C6H7P | 膦配体;有机磷;有机膦;杂环类;对照品;有机砌块;化工原料;中药对照品;有机硼化合物 | |
| 17 | 638-23-3 | 羧甲基半胱氨酸 | Carboxymethylcysteine | C5H9NO4S | 原料;胺基酸;氨基酸;对照品;添加剂;生化试剂;氨基酸类;生物化工;医药原料;化学试剂 | 成品药 |
| 18 | 638-25-5 | 辛酸戊酯 | Amyl Octanoate | C13H26O2 | 酯;化工材料;香精香料;食品添加剂;羰基化合物;食用香料（增香剂）;天然等同香料和人造香料 | |
| 19 | 638-26-6 | 10-羟基硬脂酸 | 10-hydroxystearic acid | C18H36O3 | | |
| 20 | 638-27-7 | 異氰異戊烷 | ISOAMYLISOCYANIDE | C6H11N | | |
| 21 | 638-28-8 | 2-氯己烷 | 2-Hexyl Chloride | C6H13Cl | | |
| 22 | 638-29-9 | 正戊酰氯 | Valeryl chloride | C5H9ClO | 酰卤;卤代物;中间体;有机砌块;有机原料;工业原料;有机化学;医药中间体;化工中间体;有机化工原料 | 医药中间体 |
| 23 | 638-31-3 | 2,3-二氢吡咯 | 1H-Pyrrole, 2,3-dihydro- | C4H7N | | |
| 24 | 638-32-4 | 琥珀酰胺酸 | Succinamic Acid | C4H7NO3 | | |
| 25 | 638-33-5 | 2-methyl butyl lactate | 2-methyl butyl lactate | C8H16O3 | | |
| 26 | 638-36-8 | 植烷 | PHYTANE | C20H42 | 烷烃 | |
| 27 | 638-37-9 | 丁二醛 | SUCCINALDEHYDE | C4H6O2 | | |
| 28 | 638-38-0 | 醋酸锰 | Manganous acetate | C4H6MnO4 | 锰;大货;锰盐;乙酸盐;有机化工;其他原料;有机金属盐;无机化工原料;化工产品-无机化工 | 试剂 |
| 29 | 638-39-1 | 乙酸锡(II) | Tin(II) acetate | C4H6O4Sn | 化工;化工原料;有机原料;金属有机物;有机化工原料 | |
| 30 | 638-41-5 | 氯甲酸戊酯 | Chloroformic acid n-amyl ester | C6H11ClO2 | 化工;中间体;无机物;化学连接;化工原料;羰基化合物;有机化工原料;氨基酸及其衍生物 | |
| 31 | 638-42-6 | Carbamic acid amyl ester | Carbamic acid amyl ester | C6H13NO2 | | |
| 32 | 638-44-8 | N,N'-(dithiodiethylene)bisacetamide | N,N'-(dithiodiethylene)bisacetamide | C8H16N2O2S2 | | |
| 33 | 638-45-9 | 1-碘己烷 | 1-iodohexane | C6H13I | 卤代烃;化工原料;化工材料;有机原料;无机化学;有机化工原料 | |
| 34 | 638-46-0 | 丁基乙基硫醚 | n-Butyl Ethyl Sulfide | C6H14S | | |
| 35 | 638-49-3 | 甲酸戊酯 | Amyl formate FCC | C6H12O2 | 羧酸;香精香料;食品添加剂;羰基化合物;食用香料（增香剂）;天然等同香料和人造香 | |
| 36 | 638-51-7 | 亚硝酸己酯 | Hexyl Nitrite | C6H13NO2 | | |
| 37 | 638-53-9 | 十三酸 | n-Tridecanoic acid | C13H26O2 | 羧酸;对照品;脂肪酸;有机酸;有机砌块;生化试剂;脂肪族化合物;分析试剂-色谱试剂;生化试剂-其他化学试剂 | |
| 38 | 638-54-0 | 辛二醛 | octanedial | C8H14O2 | | |
| 39 | 638-56-2 | 二乙二醇双(2-氯乙基)醚 | 1-chloro-2-{2-[2-(2-chloroethoxy)ethoxy]ethoxy}ethane | C8H16Cl2O3 | 有机原料;醚类化合物 | |
| 40 | 638-58-4 | 正十四烷基铵 | n-Tetradecanamide | C14H29NO | | |
| 41 | 638-59-5 | 乙酸十四酯 | myristyl acetate | C16H32O2 | 有机原料;有机酸酯 | |
| 42 | 638-60-8 | 2-十四烯 | 2-Tetradecene | C14H26 | | |
| 43 | 638-64-2 | STEARIC ACID-CARBOXY-14C | STEARIC ACID-CARBOXY-14C | C18H36O2 | | |
| 44 | 638-65-3 | 十八烷腈 | stearonitrile | C18H35N | 腈;氰化物 | |
| 45 | 638-66-4 | 十八烷醛 | stearaldehyde | C18H36O | 合成 | |
| 46 | 638-67-5 | 正二十三烷 | tricosane | C23H48 | 烷烃;脂肪烃;对照品;脂肪烃类;通用试剂;分析标准品;农业和环境标准品 | |
| 47 | 638-68-6 | 正三十烷 | Triacontane | C30H62 | 烷烃;脂肪烃;有机砌块;通用试剂;脂肪烃类;生化试剂 | |
| 48 | 638-71-1 | | Methylium, hydroxyoxo- (9CI) | CHO2 | | |
| 49 | 638-73-3 | 氯二碘甲烷 | chlorodiiodomethane | CHClI2 | | |
| 50 | 638-79-9 | 十一氟正戊基碘 | Perfluoropentyl Iodide | C5F11I | 增溶剂 | |
| 51 | 638-86-8 | Furost-5-ene-3,16,20,26-tetrol, (3β)- (9CI) | Furost-5-ene-3,16,20,26-tetrol, (3β)- (9CI) | C27H44O5 | | |
| 52 | 638-89-1 | | Pregna-4,16-diene-3,20-dione, 21-(acetyloxy)-9-fluoro-11-hydroxy-, (11β)- | C23H29FO5 | | |
| 53 | 638-93-7 | 地奈德1,2饱和 | Desonide 1,2-Saturated | C24H34O6 | | |
| 54 | 638-94-8 | 待索利德 | Desonide | C24H32O6 | 原料;化学;甾体类;中间体;原料药;化合物;医药原料;农业原料;日化原料;添加剂1 | |
| 55 | 638-95-9 | α-香树精 | α-Amyrin | C30H50O | 标准品;植物提取物;标准品，对照品 | |
| 56 | 638-96-0 | ALFA-AMYRENONE | URS-12-EN-3-ONE | C30H48O | | |
| 57 | 638-97-1 | Β-香树脂酮 | 18BETA(H)-OLEAN-12-EN-3-ONE | C30H48O | 三萜;标准品;植物提取物 | 标准品;植物提取物;三萜 |