Description

Eprinomectin CAS NO 123997-26-2 is a semi-synthetic macrocyclic lactone belonging to the avermectin class of compounds. It is a highly effective and broad-spectrum parasiticide with potent activity against both internal and external parasites. This product is essential for manufacturers in the animal health sector, particularly for developing topical pour-on and injectable formulations for livestock and companion animals. Its unique safety profile and efficacy make it a cornerstone of modern veterinary antiparasitic programs.

Application

• Primary active ingredient in veterinary topical pour-on solutions for cattle.
• Key component in injectable endectocide formulations for livestock.
• Used in the development of broad-spectrum antiparasitic drugs targeting nematodes and arthropods.
• Manufacturing of parasite control products for dairy cattle, with a focus on zero milk withdrawal periods.
• Research and development of novel combination therapies to combat parasite resistance.
• Active pharmaceutical ingredient (API) in veterinary medicinal products for companion animals.
• Intermediate for the synthesis of other specialty avermectin derivatives.

Basic Information

Product Name	Eprinomectin
CAS No.	123997-26-2
Molecular Formula	C50H75NO14
Molecular Weight	914.1 g/mol
Synonyms	Eprinomectin B1a; 4"-Epi-Acetylamino-4"-deoxy-avermectin B1; MK-397; Eprinex; (4"R)-4"-(Acetylamino)-4"-deoxy-avermectin B1; 5-O-Demethyl-28-deoxy-25-(1-methylpropyl)-6,28-epoxy-23-(methoxyimino)milbemycin B; UNII-6E8X4T1B7F
EINECS	Contact for details

Quality Control

Our Eprinomectin is manufactured under strict quality management systems to ensure batch-to-batch consistency and high purity. The product is tested against stringent in-house specifications, which typically include identification, assay, and related substances testing via validated HPLC methods. We support compliance with veterinary GMP and relevant pharmacopoeial standards. A comprehensive Certificate of Analysis (COA) detailing all test results is provided with each shipment.

Storage

Preserve in a tightly closed container, protected from light. Store in a cool, dry, and well-ventilated place at a controlled room temperature (15-25°C). Due to its hygroscopic nature, the container must be kept tightly sealed in a dry environment to prevent moisture absorption and degradation.

Specification

Item	Specification
Appearance	White to off-white powder
Identification (IR)	Conforms to reference standard
Identification (HPLC)	Retention time corresponds to reference
Assay (HPLC)	≥ 98.0% (on anhydrous basis)
Related Substances (HPLC)	Total impurities ≤ 2.0%
Water (KF)	≤ 1.0%
Residue on Ignition	≤ 0.1%

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