5-甲基异恶唑-4-羧酸，CAS 登记号 42831-50-5，由济南圣和化工有限公司现货供应，可提供纯度 按批次COA提供(不公开发布) 的规格，下游主要用于化工中间体。支持样品与小批量试用，批量价格请联系我们获取，验收以批次 COA 为准。
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5-Methyl-4-isoxazole carboxylic acid · CAS 42831-50-5 · C5H5NO3. UNII BL2Q213Q2M.
| CAS Registry Number | 42831-50-5 |
|---|---|
| PubChem CID | 1425240 |
| Molecular formula | C5H5NO3 |
| IUPAC name | 5-methyl-1,2-oxazole-4-carboxylic acid |
| UNII (FDA) | BL2Q213Q2M |
| Molecular Weight | 127.10 |
|---|---|
| XLogP3 | 0.3 |
| Hydrogen Bond Donor Count | 1 |
| Hydrogen Bond Acceptor Count | 4 |
| Rotatable Bond Count | 1 |
| Exact Mass | 127.026943022 |
| Monoisotopic Mass | 127.026943022 |
| Topological Polar Surface Area | 63.3 |
| Heavy Atom Count | 9 |
| Formal Charge | 0 |
| Reported hazard statements | H302 (15.4%), H315 (53.8%), H318 (30.8%), H319 (53.8%), H335 (46.2%) |
|---|
H302 (15.4%): Harmful if swallowed [Warning Acute toxicity, oral]
H315 (53.8%): Causes skin irritation [Warning Skin corrosion/irritation]
5-Methylisoxazole-4-carboxylic acid; 42831-50-5; Leflunomide Impurity D; BL2Q213Q2M; 4-Isoxazolecarboxylic acid, 5-methyl-; Leflunomide impurity D [EP]; DTXSID20195503; EC 700-400-1; LEFLUNOMIDE IMPURITY D [EP IMPURITY]; LEFLUNOMIDE IMPURITY D (EP IMPURITY); Leflunomide impurity, 5-methylisoxazole-carboxylic acid-(USP); Leflunomide impurity, 5-methylisoxazole-carboxylic acid-[USP]; LEFLUNOMIDE IMPURITY, 5-METHYLISOXAZOLE-CARBOXYLIC ACID-(USP IMPURITY); LEFLUNOMIDE IMPURITY, 5-METHYLISOXAZOLE-CARBOXYLIC ACID-[USP IMPURITY]; RefChem:537293; DTXCID90117994
CAS 42831-50-5; molecular formula C5H5NO3; molecular weight — g/mol.
5-Methylisoxazole-4-carboxylic acid, 42831-50-5, Leflunomide Impurity D, BL2Q213Q2M, 4-Isoxazolecarboxylic acid, 5-methyl-, Leflunomide impurity D [EP].
Hazard statements reported: H302, H315, H318, H319, H335.
Facts on this page are taken from PubChem (US National Library of Medicine) and Wikidata. Grade-specific data — assay, moisture, particle size, packaging, shelf life — is issued per batch on the COA and is not published here.