Methotrexate Impurity – I
(4S)-4-[[4-[[(2,4-diaminopteridin-6-yl)methyl]methylamino]benzoyl]amino]-5-methoxy-5-oxopentanoic acid (methotrexate 1-methyl ester)
| Chemical Name | (4S)-4-[[4-[[(2,4-diaminopteridin-6-yl)methyl]methylamino]benzoyl]amino]-5-methoxy-5-oxopentanoic acid (methotrexate 1-methyl ester) |
|---|---|
| CAS No. | 66147-29-3 |
| Molecular Formula | C21H24N8O5 |
| Molecular Weight | 468.47 |
| Chemical Structure |
![(4S)-4-[[4-[[(2,4-diaminopteridin-6-yl)methyl]methylamino]benzoyl]amino]-5-methoxy-5-oxopentanoic acid (methotrexate 1-methyl ester) Structure](https://bhavanishlifesciences.com/wp-content/uploads/2026/09/methotrexate-impurity-i-structure.png) |
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Methotrexate Impurity – I
Methotrexate Impurity – I is a known related substance / impurity of Methotrexate, as listed in the EP reference standard. Chemically, it is described as (4S)-4-[[4-[[(2,4-diaminopteridin-6-yl)methyl]methylamino]benzoyl]amino]-5-methoxy-5-oxopentanoic acid (methotrexate 1-methyl ester). It has the molecular formula C21H24N8O5 and a molecular weight of 468.47 g/mol. Laboratories use this reference standard for impurity identification, method validation, and batch release testing related to Methotrexate. Supplied as a certified, high-purity reference standard suitable for HPLC, GC, and LC-MS analysis.
Methotrexate impurities reference standards are useful in pharmaceutical research. They are useful in product development, ANDA and DMF filing, Quality control (QC), method validation, and stability studies. It is also useful in the identification of unknown impurities and the assessment of genotoxic potential.
We are the BHAVANISH LIFE SCIENCES specializes in manufacturing and supplying of Methotrexate impurities that meet specific pharmacopeial standards (USP/EP/BP/IP) as well as process-related impurities.
This related products or Impurities are thoroughly characterized. Supplied with detailed COA & analytical data Like NMR / MASS / HPLC / GC / IR / TGA / Potency / Structure elucidation data (SER Report) meeting regulatory compliance.
BHAVANISH LIFE SCIENCES provides this compound for research and development and Analytical testing use only, and is not meant for human consumption. With product information including CAS number, molecular formula, molecular weight details.
BHAVANISH LIFE SCIENCES in providing high-quality impurity standards to support pharmaceutical companies in maintaining drug safety and efficacy.
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