Description

Oseltamivir Phosphate CAS NO 204255-11-8 is the phosphate salt of oseltamivir, a potent and selective inhibitor of influenza virus neuraminidase. This active pharmaceutical ingredient (API) is the critical component in antiviral medications used to treat and prevent influenza A and B virus infections. It is essential for pharmaceutical manufacturers developing antiviral drugs, contract research organizations (CROs) conducting clinical studies, and academic institutions engaged in virology research.

Application

• Pharmaceutical API Manufacturing: Primary use as the active ingredient in antiviral capsules, oral suspensions, and other dosage forms.
• Generic Drug Formulation: Sourcing for the production of generic antiviral medications following patent expirations.
• Clinical Research & Development: Utilization in preclinical and clinical trials for new influenza treatments or combination therapies.
• Reference Standard: Serves as a high-purity chemical reference standard for quality control and analytical testing in laboratories.
• Antiviral Research: Used in academic and institutional research to study influenza virus mechanisms and develop next-generation inhibitors.
• Pandemic Preparedness Stockpiling: Sourced by government health agencies and large-scale distributors for strategic national stockpiles.

Basic Information

Product Name	Oseltamivir Phosphate
CAS No.	204255-11-8
Molecular Formula	C16H28N2O4•H3PO4
Molecular Weight	410.40 g/mol
Synonyms	Oseltamivir Phosphate; GS 4104; Ro 64-0796/002; (3R,4R,5S)-4-Acetamido-5-amino-3-(1-ethylpropoxy)-1-cyclohexene-1-carboxylic Acid, Ethyl Ester, Phosphate Salt; Tamiflu (Brand Name) API; Ethyl (3R,4R,5S)-5-amino-4-acetamido-3-(pentan-3-yloxy)cyclohex-1-ene-1-carboxylate phosphate
EINECS	Contact for details

Quality Control

Our Oseltamivir Phosphate is manufactured under strict quality management systems. We provide material that meets high-purity standards suitable for pharmaceutical applications, with comprehensive testing for identity, assay, and impurities. A Certificate of Analysis (COA) is provided with each batch, detailing results against specifications. Our quality commitment ensures compliance with cGMP principles and supports regulatory filings for our global clientele.

Storage

Preserve in a tightly closed container, protected from light. Store in a cool, dry place at controlled room temperature (15-25°C). Due to its hygroscopic (moisture-sensitive) nature, the container must be kept tightly sealed in a dry environment to prevent degradation. For long-term storage, consider conditions with low humidity.

Specification

Item	Specification
Appearance	White to off-white crystalline powder
Identification (IR)	Conforms
Identification (HPLC)	Retention time corresponds to reference standard
Assay (HPLC)	98.0% - 102.0% (on anhydrous basis)
Water Content (KF)	≤ 1.0%
Residue on Ignition	≤ 0.1%
Heavy Metals	≤ 20 ppm
Related Substances (HPLC)	Individual impurity: ≤ 0.5% Total impurities: ≤ 2.0%
Microbial Limits	Meets requirements for pharmaceutical substances

Note: Specifications can be tailored. Please contact us for the detailed technical data sheet of a specific grade.