4,5-Bis(2-methoxyethoxy)-2-nitrobenzonitrile (CAS 236750-65-5) is a benzene ring carries two methoxyethoxy side chains, a nitro group and a nitrile group. It is recorded in the GSRS substance registry and is an established advanced intermediate and specified impurity of the anticancer drug erlotinib, an epidermal growth factor receptor tyrosine kinase inhibitor used in non-small-cell lung cancer and
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Pyridinium p-toluenesulfonate (CAS 24057-28-1), universally abbreviated PPTS, is the colourless to white crystalline salt formed from pyridine and p-toluenesulfonic acid, supplied as a white to almost white powder or crystal with an assay of 98 percent or higher. It is a non-hygroscopic, easy-to-weigh solid that is soluble in water and polar organic solvents and is
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Oleamidopropyl betaine (CAS 25054-76-6) is an amphoteric surfactant derived from oleic acid in which the fatty amide chain is linked through a propyl spacer to a betaine head group, a quaternary ammonium carboxylate. It is normally supplied as a pale yellow to amber aqueous solution containing 30 to 40 percent active matter and is compatible
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Kanamycin A sulfate (CAS 25389-94-0), also catalogued as kanamycin sulfate or kanamycin A monosulfate, is the sulfate salt of kanamycin A, an aminoglycoside antibiotic originally isolated from the soil bacterium Streptomyces kanamyceticus. It is a white to off-white, highly water-soluble powder that is stable in the dry state at 98 percent purity or higher and
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Diethoxydiphenylsilane (CAS 2553-19-7), also named diphenyldiethoxysilane, is a colourless to almost colourless clear liquid in which a phenyl-rich silicon centre bears two hydrolytically active ethoxy groups, supplied at 98 percent purity or higher by gas chromatography. It is moisture sensitive and hydrolyses in the presence of water to give diphenylsilanediol and crosslinked diphenylsiloxane condensation products,
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4-[2-(Dimethylamino)ethoxy]benzylamine (CAS 20059-73-8), also named p-(2-(dimethylamino)ethoxy)benzylamine or 2-(4-(aminomethyl)phenoxy)-N,N-dimethylethanamine, is a colourless to pale yellow oily liquid or low-melting solid containing two basic nitrogen atoms separated by an aromatic ether spacer. The molecule combines a primary benzylic amine with a tertiary dimethylamino group, giving it strong hydrogen-bonding and ionic character and excellent solubility in water and
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Baloxavir Impurity 51 (CAS 2136287-61-9) is a defined related substance of the antiviral drug baloxavir marboxil, identified by its specific structure and CAS registry number as a process-related impurity of the influenza treatment. It is supplied as a reference-standard-grade solid, typically in milligram quantities under catalogue numbers such as C4X-210851, and it is intended solely
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Baloxavir Impurity C149 (CAS 2136287-68-6) is the 4-methylbenzenesulfonate salt form of a baloxavir marboxil related substance, described in reference-standard catalogues as related to Baloxavir Impurity 5. It is a white to off-white solid supplied as an analytical reference material in small quantities for pharmaceutical quality control, and it is not intended for human or veterinary
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2-Ethoxy-1-naphthoic acid (CAS 2224-00-2) is a white to yellowish crystalline powder with a distinct odour that combines a naphthalene ring, an ethoxy substituent at the 2-position and a carboxylic acid at the 1-position. It is soluble in common organic solvents and only sparingly soluble in water, and its solubility behaviour in ethanol, methanol and other
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3-Ethoxybenzaldehyde (CAS 22924-15-8), also called m-ethoxybenzaldehyde, is a colourless to brownish clear liquid with a strong aromatic aldehyde odour, a boiling point near 245 degrees Celsius and a melting point reported around 177 degrees Celsius. Suppliers list a purity of 97 to 98 percent for laboratory and industrial use, with good solubility in most common
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1,2-Bis(1-ethoxyethoxy)-4-vinylbenzene (CAS 186768-92-3) is a dialkoxy-protected styrene monomer in which both hydroxyl groups of the catechol-like 3,4-dihydroxystyrene unit are masked as ethoxyethyl acetals while the vinyl group remains free for polymerisation. It is a colourless to pale liquid supplied at 98 percent purity for research and industrial manufacturing use, and it is normally stabilised against
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Butyl methanesulfonate (CAS 1912-32-9), also called methanesulfonic acid butyl ester, n-butyl methanesulphonate or NSC 36060, is a colourless to pale yellow liquid with a density near 1.107 grams per cubic centimetre at twenty degrees Celsius and a boiling point of about 81 to 83 degrees Celsius at four torr. It is the butyl member of
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Dichloromethyltriethoxysilane (CAS 19369-03-0), also written as (dichloromethyl)triethoxysilane or silane, (dichloromethyl)triethoxy-, is a colourless transparent organosilicon liquid in which a dichloromethyl group is attached to a silicon atom bearing three ethoxy substituents. It is moisture sensitive and hydrolyses on contact with water or humid air, releasing ethanol and hydrogen chloride, so it is stored sealed under
This compound (CAS 200000-59-5), chemically (2R,3S)-2-[(1R)-1-[3,5-bis(trifluoromethyl)phenyl]ethoxy]-3-(4-fluorophenyl)morpholine 4-methylbenzenesulfonate, is an advanced chiral intermediate in the manufacture of the antiemetic drug aprepitant. It is a solid that should be stored dry, cool and protected from light and moisture, and it is catalogued as a pharmaceutical intermediate rather than a finished active substance. The molecule carries several defined
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Betaine citrate (CAS 17671-50-0), also called trimethylglycine citrate or the citric acid salt of the quaternary ammonium zwitterion betaine, is a white to off-white crystalline, highly water-soluble powder with a mildly acidic and pleasant taste and good stability under normal storage conditions. It combines two complementary functions: betaine is a natural osmolyte and methyl-group donor
This compound (CAS 1803573-21-8), named 2-(bis(tert-butoxycarbonyl)amino)-5-bromopyridin-3-yl 4-methylbenzenesulfonate or imidodicarbonic acid 2-[5-bromo-3-[[(4-methylphenyl)sulfonyl]oxy]-2-pyridinyl]-, 1,3-bis(1,1-dimethylethyl) ester, is a heavily functionalised pyridine building block supplied as a solid at 98 percent purity for laboratory and manufacturing use. Three reactive sites coexist in the molecule: an aryl bromide, a tosylate ester and two acid-labile tert-butoxycarbonyl groups, so it must be
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