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Rivastigmine|CAS#:123441-03-2
作者:德尔塔 日期:2022-11-18
产品名称:卡巴拉汀英文名称:Rivastigmine别名:利斯的明; 卡巴拉汀英文别名:S-Rivastigmine;3-((1S)-1-(Dimethylamino)ethyl)phenyl N-ethyl-N-methylcarbamate; Ethylmethylcarbamic acid 3-((1S)-1-(dimethylamino)ethyl)phenyl ester规格或纯度:≥99%运输条件:冰袋运输Rivastigmine酒石酸盐是胆碱酯酶抑制剂,IC50为5.5 uM,还能抑制丁酰胆碱酯酶和乙酰胆碱酯酶。CAS编号:123441-03-2敏感性对光线敏感溶解性:DMSO储存温度:2-8°C储存分子量:250.34分子式:C14H22N2O2货号:Delta-77991德尔塔热销产品推荐:DSPE-PEG-COOH,二硬脂酰磷脂酰乙醇胺-聚乙二醇-羧基MAL-PEG-NHS , 马来酰亚胺PEG活性酯DSPE-PEG-Mal、二硬脂酰磷脂酰乙醇胺-聚乙二醇-马来酰亚胺DSPE-PEG-cRGD,磷脂-聚乙二醇-靶向穿膜肽cRGD羧基化四氧化三铁纳米粒子,DMSA Coated Fe3O4 NanoparticlesCAS:59061-53-9|ZIF-8DMG-PEG2000,1,2-二肉豆蔻酰-rac-甘油-3-甲氧基聚乙二醇DSPE-PEG2000-FA,磷脂-聚乙二醇2000-叶酸DPPA,1,2-二棕榈酰-sn-甘油-3-磷酸DSPE-PEG-NH39,二硬脂酰磷脂酰乙醇胺-聚乙二醇-氨基
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Pentagalloylglucose|CAS#:14937-32-7
作者:德尔塔 日期:2022-11-18
产品名称:β-五没食子酰葡萄糖英文名称:Pentagalloylglucose别名:β-五没食子酰葡萄糖规格或纯度:分析标准品CAS编号:14937-32-7储存温度:储存温度 2-8°C密度2.0500分子量:940.677分子式:C41H32O26SmilesO=C(O[C@@H]1[C@@H](COC(=O)c2cc(O)c(O)c(O)c2)O[C@@H](OC(=O)c2cc(O)c(O)c(O)c2)[C@H](OC(=O)c2cc(O)c(O)c(O)c2)[C@H]1OC(=O)c1cc(O)c(O)c(O)c1)c1cc(O)c(O)c(O)c1;O=C(O[C@H]1C(COC(=O)c2cc(O)c(O)c(O)c2)O[C@@H](OC(=O)c2cc(O)c(O)c(O)c2)[C@H](OC(=O)c2cc(O)c(O)c(O)c2)[货号:Delta-65238德尔塔热销产品推荐:DSPE-PEG-COOH,二硬脂酰磷脂酰乙醇胺-聚乙二醇-羧基MAL-PEG-NHS , 马来酰亚胺PEG活性酯DSPE-PEG-Mal、二硬脂酰磷脂酰乙醇胺-聚乙二醇-马来酰亚胺DSPE-PEG-cRGD,磷脂-聚乙二醇-靶向穿膜肽cRGD羧基化四氧化三铁纳米粒子,DMSA Coated Fe3O4 NanoparticlesCAS:59061-53-9|ZIF-8DMG-PEG2000,1,2-二肉豆蔻酰-rac-甘油-3-甲氧基聚乙二醇DSPE-PEG2000-FA,磷脂-聚乙二醇2000-叶酸DPPA,1,2-二棕榈酰-sn-甘油-3-磷酸DSPE-PEG-NH38,二硬脂酰磷脂酰乙醇胺-聚乙二醇-氨基
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OAC1|CAS#:300586-90-7
作者:德尔塔 日期:2022-11-18
产品名称:OAC1,Oct4激活剂英文名称:OAC1别名:OAC-1英文别名:OAC-1;Oct4-activating Compound 1;N-1H-Pyrrolo[2,3-c]pyridin-5-ylbenzamide规格或纯度:≥97%运输条件:超低温冰袋运输生化机理:Oct4激活剂。与单独的4F相比,在4F(Oct4,Sox2,c-Myc和Klf4)存在的情况下,iPSC的编程增强并加快了20倍。诱导Oct4,Sox2和Nanog以及Tet1的mRNA表达。对p53-p21通路或Wnt-β-catenin信号传导无影响。OAC1是转录因子Oct4活化剂,提高iPSC的重编程效率和编程过程中的加速。An Oct-4 activator which increases mRNA expression of Oct-4, Sox-2, Nanog, and Tet1AC1 (Oct4-activating compound 1) can enhance the efficiency of reprogramming.An Oct-4 activator which increases mRNA expression of Oct-4, Sox-2, Nanog, and Tet1CAS编号:300586-90-7敏感性对光敏感、对空气敏感、对热敏感折光率1.76熔点:197.05°C沸点~386.6 °C at 760 mmHg溶解性:溶于DMSO, 最高浓度 (mg/mL): 23.73, 最高浓度(mM): 100;溶于ethanol, 最高浓度 (mg/mL): 23.73, 最高浓度(mM): 100储存温度:-20°C储存MDL号:MFCD00572806密度1.4分子量:237.26分子式:C14H11N3O货号:Delta-789882德尔塔热销产品推荐:DSPE-PEG-COOH,二硬脂酰磷脂酰乙醇胺-聚乙二醇-羧基MAL-PEG-NHS , 马来酰亚胺PEG活性酯DSPE-PEG-Mal、二硬脂酰磷脂酰乙醇胺-聚乙二醇-马来酰亚胺DSPE-PEG-cRGD,磷脂-聚乙二醇-靶向穿膜肽cRGD羧基化四氧化三铁纳米粒子,DMSA Coated Fe3O4 NanoparticlesCAS:59061-53-9|ZIF-8DMG-PEG2000,1,2-二肉豆蔻酰-rac-甘油-3-甲氧基聚乙二醇DSPE-PEG2000-FA,磷脂-聚乙二醇2000-叶酸DPPA,1,2-二棕榈酰-sn-甘油-3-磷酸DSPE-PEG-NH37,二硬脂酰磷脂酰乙醇胺-聚乙二醇-氨基
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NADP, Disodium Salt|CAS#:24292-60-2
作者:德尔塔 日期:2022-11-18
产品名称:氧化型辅酶II 二钠(β-NADP-Na₂)英文名称:NADP, Disodium Salt别名:β-NADP-Na₂;beta-烟酰胺腺嘌呤二核苷酸磷酸二钠盐;三磷酸吡啶核苷酸 二钠盐;β-NADH磷酸 二钠盐;β-磷酸烟酰胺腺嘌呤二核苷酸 二钠盐英文别名:β-NADH phosphate disodium salt; β-NADP-Na2; Triphosphopyridine nucleotide disodium salt; β-Nicotinamide adenine dinucleotide phosphate disodium salt规格或纯度:97%运输条件:超低温冰袋运输生化机理:NADP和NADPH形成氧化还原对。NADP是NADPH的氧化形式。NADP / NADPH是一种辅酶,可在许多应用中通过电子的传输来支持氧化还原反应。A participant coenzyme in aerobic and anaerobic oxidation烟酰胺腺嘌呤二核苷酸磷酸(NADP)和NADPH形成氧化还原对。 NADP / NADPH是一种辅酶,经由电子传输支持氧化还原反应,特别是如脂质和核酸合成的厌氧反应。 NADP / NADPH是一种辅酶,耦合各种细胞色素P450系统和氧化酶/还原酶反应系统,如硫氧蛋白还原酶/硫氧蛋白系统的辅酶。A participant coenzyme in aerobic and anaerobic oxidationNicotinamide adenine dinucleotide phosphate (NADP) and NADPH form a redox pair. NADP/NADPH is a coenzyme that supports redox reactions via the transport of electrons in a vast array of applications, especially anaerobic reactions such as lipid and nucleic acid synthesis. NADP/NADPH is a coenzyme couple in various cytochrome P450 systems and oxidase/reductase reaction systems, such as the thioredoxin reductase/thioredoxin system.CAS编号:24292-60-2敏感性对热敏感 ;对湿度敏感;溶解性:Soluble in water (50 mg/ml), 0.001% aqueous buffer, pH 7.0, methanol, and ethanol (less soluble). Insoluble in ether, and ethyl acetate.储存温度:-20°C储存,充氩MDL号:MFCD00065390分子量:787.37分子式:C21H26N7Na2O17P
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Pidotimod|CAS#:121808-62-6
作者:德尔塔 日期:2022-11-18
产品名称:匹多莫德英文名称:Pidotimod别名:匹多莫德; 匹多替莫;(R)-3-[[(S)-5-氧-2-吡咯烷基]羰基]-1,3-噻唑啉-4-羧酸;英文别名:(R)-3-[[(S)-5-Oxo-2-pyrrolidinyl]carbonyl]-1,3-thiazolidine-4-carboxylic Acid ;(4R)-3-{[(2S)-5-oxopyrrolidin-2-yl]carbonyl}-1,3-thiazolidine-4-carboxylic acid;3-L-Pyroglutamyl-L-thiaziolidine-4carboxylic acid; (4R)-3-(5-Oxo-L-prolyl)-1,3-thiazolidine-4-ca应用:A synthetic dipeptide with immunological modulatory activity on both the adaptive and innate immune responses.规格或纯度:≥98%运输条件:冰袋运输生化机理:Pidotimod is a synthetic dipeptide with immunological modulatory activity on both the adaptive and innate immune responses. This compound has been shown to induce dendritic cell maturation and up-regulate the expression of HLA-DR and co-stimulatory molecules CD83 and CD86, which are integral to communication with adaptive immunity cells. Pidotimod has also been shown to stimulate dendritic cells to release pro-inflammatory molecules such as MCP-1 and TNF-α cytokines, and to inhibit thymocyte apoptosis caused by a variety of apoptosis inducing molecules.Immunostimulant. Active in adaptive and innate immune responses in vitro and in vivo . Shows adjuvant effects in vivo . Stimulates the release of pro-inflammatory factors from dendritic cells. Orally active.Pidotimod是一种合成的二肽分子,对适应性和先天性免疫反应都有生物学免疫活性。对动物和人的样本进行体外研究发现Pidotimod对适应性和先天性免疫反应都有很好的活性,这一结论也在体内实验中得到了确认。这些活性已经应用到临床,在减轻儿童上呼吸道和尿道感染复发率上效果良好。在成人呼吸道感染复发的抑制上也
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Pranoprofen|CAS#:52549-17-4
作者:德尔塔 日期:2022-11-18
产品名称:普拉洛芬英文名称:Pranoprofen别名:普拉洛芬;2-(5H-苯并吡喃并[2,3-b]吡啶-7-基)丙酸英文别名:Niflan;Oftalar;a-Methyl-5H-[1]benzopyrano[2,3-b]pyridine-7-acetic acid, 2-(5H-Chromeno[2,3-b]pyridin-7-yl)propanoic acid;2-(5H-[1]-Benzopyrano[2,3-b]pyridin-7-yl)propionic acid;2-(5H-Chromeno[2,3-b]pyridin-7-yl)propanoic Acid;2-(5H-[1]Benzopyrano[2,3-b]py应用:A non-steroidal antiinflammatory.规格或纯度:≥99%运输条件:超低温冰袋运输生化机理:Pranoprofen is a cyclooxygenase (COX) inhibitor.Pranoprofen 是一种非甾体抗炎试剂 (NSAID),用于角膜炎或其他眼科疾病的研究。Pranoprofen 抑制 COX1/2 酶,从而阻断花生四烯酸转化为二十烷醇,减少前列腺素的合成。Pranoprofen is a PGE2 inhibitor with IC50 of 7.5 μM.A non-steroidal antiinflammatory.CAS编号:52549-17-4敏感性对热敏感熔点:181-183°C溶解性:DMSO: 20 mg/mL, clear储存温度:-20°C储存RTECSDJ3100950MDL号:MFCD00866111分子量:255.27分子式:C15H13NO3备注:200mg卖完停产,不再备货 货号:Delta-4888德尔塔热销产品推荐:DSPE-PEG-COOH,二硬脂酰磷脂酰乙醇胺-聚乙二醇-羧基MAL-PEG-NHS , 马来酰亚胺PEG活性酯DSPE-PEG-Mal、二硬脂酰磷脂酰乙醇胺-聚乙二醇-马来酰亚胺DSPE-PEG-cRGD,磷脂-聚乙二醇-靶向穿膜肽cRGD羧基化四氧化三铁纳米粒子,DMSA Coated Fe3O4 NanoparticlesCAS:59061-53-9|ZIF-8DMG-PEG2000,1,2-二肉豆蔻酰-rac-甘油-3-甲氧基聚乙二醇DSPE-PEG2000-FA,磷脂-聚乙二醇2000-叶酸DPPA,1,2-二棕榈酰-sn-甘油-3-磷酸DSPE-PEG-NH34,二硬脂酰磷脂酰乙醇胺-聚乙二醇-氨基
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Primidone|CAS#:125-33-7
作者:德尔塔 日期:2022-11-18
产品名称:扑米酮英文名称:Primidone别名:普里米酮; 5-乙基-5-苯基六氢嘧啶-4,6-二酮; 2-脱氧苯巴比妥英文别名:5-Ethyl-5-phenylhexahydropyrimidine-4,6-dione ;Mysoline; Neurosyn; Mylepsin;2-Deoxyphenobarbital应用:A compound that potentiates GABA receptor function.规格或纯度:≥98%(HPLC)运输条件:冰袋运输A compound that potentiates GABA receptor function.A compound that potentiates GABA receptor function.CAS编号:125-33-7折光率1.53熔点:281°C沸点520.70° C溶解性:Soluble in acetic acid (50 mg/ml), DMSO (100 mM), methanol, ethanol (3 mg/ml at 25 °C), and water (
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Pramiracetam Hydrate|CAS#:68497-62-1
作者:德尔塔 日期:2022-11-18
产品名称:普拉西坦 水合物英文名称:Pramiracetam Hydrate别名:普拉西坦水合物英文别名:Amacetam; N-[2-(Diisopropylamino)ethyl]-2-(2-oxopyrrolidin-1-yl)acetamide; N-[2-[Bis(1-methylethyl)amino]ethyl]-2-oxo-1-pyrrolidineacetamide; Vinpotropil;Pramistar; Neupramir; Remen应用:An inhibitor of PREP.规格或纯度:≥98% (HPLC)运输条件:冰袋运输An inhibitor of PREP.An inhibitor of PREP.CAS编号:68497-62-1熔点:47-48°C沸点164 °C/0.1 mmHg溶解性:Soluble in water (10 mg/ml), DMSO (54 mg/ml at 25 °C), and ethanol (
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CAS:4349-41-1|5-甲基四氢杂酸
作者:德尔塔 日期:2022-11-18
产品名称:5-甲基四氢杂酸英文名称:5-Methyl Tetrahedropteroic Acid运输条件:常规运输CAS编号:4349-41-1分子量:330.34分子式:C₁₅H₁₈N₆O₃德尔塔热销产品推荐:DSPE-PEG-COOH,二硬脂酰磷脂酰乙醇胺-聚乙二醇-羧基MAL-PEG-NHS , 马来酰亚胺PEG活性酯DSPE-PEG-Mal、二硬脂酰磷脂酰乙醇胺-聚乙二醇-马来酰亚胺DSPE-PEG-cRGD,磷脂-聚乙二醇-靶向穿膜肽cRGD羧基化四氧化三铁纳米粒子,DMSA Coated Fe3O4 NanoparticlesCAS:59061-53-9|ZIF-8DMG-PEG2000,1,2-二肉豆蔻酰-rac-甘油-3-甲氧基聚乙二醇DSPE-PEG2000-FA,磷脂-聚乙二醇2000-叶酸DPPA,1,2-二棕榈酰-sn-甘油-3-磷酸DSPE-PEG-NH9831,二硬脂酰磷脂酰乙醇胺-聚乙二醇-氨基
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CAS:947141-18-6|5-甲基己醛-d7
作者:德尔塔 日期:2022-11-18
产品名称:5-甲基己醛-d7英文名称:5-Methylhexanal-d7英文别名:5-Methylhexan-1-al-d7运输条件:常规运输CAS编号:947141-18-6分子量:121.23分子式:C7H7D7O货号:Delta-11815853德尔塔热销产品推荐:DSPE-PEG-COOH,二硬脂酰磷脂酰乙醇胺-聚乙二醇-羧基MAL-PEG-NHS , 马来酰亚胺PEG活性酯DSPE-PEG-Mal、二硬脂酰磷脂酰乙醇胺-聚乙二醇-马来酰亚胺DSPE-PEG-cRGD,磷脂-聚乙二醇-靶向穿膜肽cRGD羧基化四氧化三铁纳米粒子,DMSA Coated Fe3O4 NanoparticlesCAS:59061-53-9|ZIF-8DMG-PEG2000,1,2-二肉豆蔻酰-rac-甘油-3-甲氧基聚乙二醇DSPE-PEG2000-FA,磷脂-聚乙二醇2000-叶酸DPPA,1,2-二棕榈酰-sn-甘油-3-磷酸DSPE-PEG-NH9830,二硬脂酰磷脂酰乙醇胺-聚乙二醇-氨基
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CAS:1860-39-5|5-甲基己醛
作者:德尔塔 日期:2022-11-18
产品名称:5-甲基己醛英文名称:5-Methylhexanal英文别名:5-Methylhexan-1-al运输条件:常规运输CAS编号:1860-39-5分子量:114.19分子式:C₇H₁₄O德尔塔热销产品推荐:DSPE-PEG-COOH,二硬脂酰磷脂酰乙醇胺-聚乙二醇-羧基MAL-PEG-NHS , 马来酰亚胺PEG活性酯DSPE-PEG-Mal、二硬脂酰磷脂酰乙醇胺-聚乙二醇-马来酰亚胺DSPE-PEG-cRGD,磷脂-聚乙二醇-靶向穿膜肽cRGD羧基化四氧化三铁纳米粒子,DMSA Coated Fe3O4 NanoparticlesCAS:59061-53-9|ZIF-8DMG-PEG2000,1,2-二肉豆蔻酰-rac-甘油-3-甲氧基聚乙二醇DSPE-PEG2000-FA,磷脂-聚乙二醇2000-叶酸DPPA,1,2-二棕榈酰-sn-甘油-3-磷酸DSPE-PEG-NH9829,二硬脂酰磷脂酰乙醇胺-聚乙二醇-氨基
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CAS:10231-96-6|5-甲基山梨酸乙酯
作者:德尔塔 日期:2022-11-18
产品名称:5-甲基山梨酸乙酯英文名称:5-Methyl-sorbic Acid Ethyl Ester运输条件:常规运输CAS编号:10231-96-6分子量:154.21分子式:C9H14O2货号:Delta-12277545德尔塔热销产品推荐:DSPE-PEG-COOH,二硬脂酰磷脂酰乙醇胺-聚乙二醇-羧基MAL-PEG-NHS , 马来酰亚胺PEG活性酯DSPE-PEG-Mal、二硬脂酰磷脂酰乙醇胺-聚乙二醇-马来酰亚胺DSPE-PEG-cRGD,磷脂-聚乙二醇-靶向穿膜肽cRGD羧基化四氧化三铁纳米粒子,DMSA Coated Fe3O4 NanoparticlesCAS:59061-53-9|ZIF-8DMG-PEG2000,1,2-二肉豆蔻酰-rac-甘油-3-甲氧基聚乙二醇DSPE-PEG2000-FA,磷脂-聚乙二醇2000-叶酸DPPA,1,2-二棕榈酰-sn-甘油-3-磷酸DSPE-PEG-NH9828,二硬脂酰磷脂酰乙醇胺-聚乙二醇-氨基
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CAS:1356354-21-6|5-甲基己基奥利司他癸酸酯
作者:德尔塔 日期:2022-11-18
产品名称:5-甲基己基奥利司他癸酸酯英文名称:5-Methylhexyl orlistat decyl ester运输条件:常规运输CAS编号:1356354-21-6分子量:481.71分子式:C28H51NO5货号:Delta-71750373德尔塔热销产品推荐:DSPE-PEG-COOH,二硬脂酰磷脂酰乙醇胺-聚乙二醇-羧基MAL-PEG-NHS , 马来酰亚胺PEG活性酯DSPE-PEG-Mal、二硬脂酰磷脂酰乙醇胺-聚乙二醇-马来酰亚胺DSPE-PEG-cRGD,磷脂-聚乙二醇-靶向穿膜肽cRGD羧基化四氧化三铁纳米粒子,DMSA Coated Fe3O4 NanoparticlesCAS:59061-53-9|ZIF-8DMG-PEG2000,1,2-二肉豆蔻酰-rac-甘油-3-甲氧基聚乙二醇DSPE-PEG2000-FA,磷脂-聚乙二醇2000-叶酸DPPA,1,2-二棕榈酰-sn-甘油-3-磷酸DSPE-PEG-NH9827,二硬脂酰磷脂酰乙醇胺-聚乙二醇-氨基
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CAS:936329-94-1|(吗啉-4-基)甲基三氟硼酸钾
作者:德尔塔 日期:2022-11-18
产品名称:(吗啉-4-基)甲基三氟硼酸钾英文名称:Potassium (morpholin-4-yl)methyltrifluoroborate运输条件:常规运输CAS编号:936329-94-1分子量:207.05分子式:C5H10BF3KNOSmiles[B-](CN1CCOCC1)(F)(F)F.[K+]货号:Delta-45588142德尔塔热销产品推荐:DSPE-PEG-COOH,二硬脂酰磷脂酰乙醇胺-聚乙二醇-羧基MAL-PEG-NHS , 马来酰亚胺PEG活性酯DSPE-PEG-Mal、二硬脂酰磷脂酰乙醇胺-聚乙二醇-马来酰亚胺DSPE-PEG-cRGD,磷脂-聚乙二醇-靶向穿膜肽cRGD羧基化四氧化三铁纳米粒子,DMSA Coated Fe3O4 NanoparticlesCAS:59061-53-9|ZIF-8DMG-PEG2000,1,2-二肉豆蔻酰-rac-甘油-3-甲氧基聚乙二醇DSPE-PEG2000-FA,磷脂-聚乙二醇2000-叶酸DPPA,1,2-二棕榈酰-sn-甘油-3-磷酸DSPE-PEG-NH9826,二硬脂酰磷脂酰乙醇胺-聚乙二醇-氨基
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CAS:90055-48-4|(±)-盐酸氯吡格雷
作者:德尔塔 日期:2022-11-18
产品名称:(±)-盐酸氯吡格雷英文名称:(±)-Clopidogrel hydrochloride英文别名:Plavix; Methyl 2-(4,5,6,7-tetrahydrothieno[3,2-c]pyridin-5-yl)-2-(2-chlorophenyl)acetate hydrochloride运输条件:冰袋运输(±)-氯吡格雷盐酸盐是噻吩并吡啶二磷酸腺苷(ADP)-受体拮抗剂。此外,该配体用作选择性不可逆的P2Y12受体拮抗剂。已知P2Y12是位于血小板膜上的ADP受体,负责血小板聚集和血纤蛋白的交联。该机制涉及阻断糖蛋白IIb / IIIa的激活。已知(±)-氯吡格雷盐酸盐通过形成二硫键与ADP受体相互作用。此外,(±)-氯吡格雷盐酸盐被来自肝脏的细胞色素P450酶(特别是CYP2C19)激活。(±)-Clopidogrel hydrochloride is a thienopyridine adenosine diphosphate (ADP)-receptor antagonist. In addition, this ligand functions as a selective irreversible P2Y12 receptor antagonist. It is known that P2Y12 are ADP receptors located on platelet membranes and are responsible for platelet aggregation and cross-linking by fibrin. This mechanism involves blocking the activation of glycoprotein IIb/IIIa. It is known that (±)-Clopidogrel hydrochloride interacts with the ADP receptor by forming disulfide bonds. Furthermore, (±)-Clopidogrel hydrochloride is activated by cytochrome P450 enzymes from the liver, specifically CYP2C19.CAS编号:90055-48-4折光率n20D1.62 (Predicted)溶解性:Soluble in DMSO (100 mM), ethanol (100 mM), DMF (~20 mg/ml), and DMSO:PBS (1:2, pH 7.2) (~0.33 mg/ml).储存温度:2-8°C储存,干燥分子量:358.28分子式:C₁₆H₁₆NO₂SCl・HClSmilesCOC(=O)C(C1=CC=CC=C1Cl)N2CCC3=C(C2)C=CS3.Cl货号:Delta-22386150德尔塔热销产品推荐:DSPE-PEG-COOH,二硬脂酰磷脂酰乙醇胺-聚乙二醇-羧基MAL-PEG-NHS , 马来酰亚胺PEG活性酯DSPE-PEG-Mal、二硬脂酰磷脂酰乙醇