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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This compound (CAS 185225-84-7) is the (1S,2R)-2-fluorocyclopropanamine 4-methylbenzenesulfonate salt, the optical antipode of the corresponding (1R,2S) derivative and known in the impurity literature as sitafloxacin impurity 20 or Citafloxacin impurity 15. It is a white to off-white crystalline solid with high chiral purity, soluble in water and polar organic solvents and supplied at 99 percent
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Ethyl 2-(2-chloroethoxy)acetate (CAS 17229-14-0), also listed as ethyl 2-chloroethoxyl acetic acid or ethyl 2-chloroethoxy acetate, is a colourless liquid bifunctional ester containing a reactive primary alkyl chloride and an ethyl ester on a short glycol-like backbone. It is stored sealed, dry and refrigerated at two to eight degrees Celsius because the chloroether linkage is sensitive
L-Leucine benzyl ester p-toluenesulfonate (CAS 1738-77-8), commonly abbreviated H-Leu-OBzl.TosOH, is the crystalline tosylate salt of the benzyl ester of L-leucine and is classified as a dangerous good for transport. It is a white to off-white solid that dissolves in methanol, ethanol, dimethylformamide and dichloromethane and is stable in storage when kept dry and cool away
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H-Phe-OBzl.TosOH, or L-phenylalanine benzyl ester p-toluenesulfonate (CAS 1738-78-9), is the tosylate salt of the benzyl ester of L-phenylalanine. It is a white crystalline solid with good storage stability when kept dry, and it is soluble in polar aprotic and alcoholic solvents such as dimethylformamide, dimethyl sulfoxide, methanol and dichloromethane, and only sparingly soluble in water.
Linezolid mesylate ester (CAS 174649-09-3), also known as linezolid related compound D, Linezolid USP Related Compound D or (R)-[3-(3-fluoro-4-morpholinophenyl)-2-oxooxazolidin-5-yl]methyl methanesulfonate, is a white to off-white crystalline solid supplied at 99 percent purity in quantities ranging from ten milligrams to several grams. It is the mesylate ester of the oxazolidinone alcohol at the heart of the
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Lead(II) methanesulfonate (CAS 17570-76-2) is a water-soluble lead salt normally supplied as a 50 percent by weight aqueous solution, a clear colourless to slightly yellow liquid with a density noticeably above that of water and no strong odour. Because lead ions are neurotoxic, bioaccumulative and classified as reproductive and developmental toxins, the material is regulated
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