5-Methyl-4-Isoxazolecarboxylic Acid for Leflunomide CAS NO.42831-50-5

Leflunomide Intermediate:5-Methyl-4-Isoxazolecarboxylic Acid CAS:42831-50-5 

HANGZHOU THINK CHEMICAL CO., LTD. (THINKCHEM) is an integrative corporation of trade, research and contract manufacture.

With about ten years of business experiences on the marketing & distribution, thinkchem specializes in exporting pharmaceuticals, veterinary drugs, feed additives, intermediates, fine chemicals, plants extracts, pesticides, food & nutrition additives.

Thinkchem is good at offering excellent outsourcing services to overseas customers as well as laboratory support.

Custom manufacture

Thinkchem is good at offering contract manufacture and custom synthesis under confidential agreement timely and effectively, and providing sales service from grams ,kilograms to multi-tons particularly for pharmaceuticals and their intermediates discovery and development. Thinkchem is equipped with modern lab apparatus including HPLC, GC. TLC AND NMR, motivated by a team of highly qualified personnel using these equipments.

Staff

Thinkchem is composed of chemical technicians, analytical chemists, organic chemists, and chemical engineers educated in leading universities in china. Our staff is supported by a group of consultants from academia with expertise in chemical synthesis and analytical chemistry.

Leflunomide Intermediate:5-Methyl-4-Isoxazolecarboxylic Acid CAS:42831-50-5 

Items                 Specificationns                    Results

Appearance:      A white to off-crystalline powder               Conform  

Identification:   IR Spectrum similar to working standard          Conform

Loss on drying:            0.5%max.                          0.23%

Residue on ignition:        0.1%max.                          Conform

Heavy metals:            20ppm max.                         <20ppm

Chromatography:

Individual Impurities:         0.5%max.                        0.21%

Total impurities:             1.0%max.                        0.30%

Melting Point:               164~168C                    166~168C

3-Methyl isomeric compound:   0.1%max.                    0.05%

Assay:(HPLC):                98.5%min.                    99.7%

Conclusion:It complies with the requirement of Enterprise’s standard.

1. Well-trained professional sales team dedicated to source, audit and export.

2. Well-trained R & D team equipped with new knowledge, new ideas and new insights to support product development and innovation.

3. Well-established partnership with major pharmaceutical and chemical companies in china.

4. Wide range of products and efficient regulatory documentation offered to customers.