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2,3,5-Collidine is omeprazole intermediate which is the drug involved in proton pump inhibitors to block the production of stomach acid. It is used in the manufacture vitamin D3.
Mittelbach M.; Schmidt HW.; Uray G.; Junek H.; Lamm B.; Ankner K.; Brändström A.; Simonsson R. Synthesis of 4-methoxy-2,3,5-trimethylpyridine: a specific building block for compounds with gastric-acid inhibiting activity. Acta Chemica Scandinavica. Series B: Organic Chemistry and Biochemistry. 1988, 42, (8), 524-529.
Hazard Statements: H227-H302-H312-H331-H315-H319-H335
Combustible liquid. Harmful if swallowed. Harmful in contact with skin. Toxic if inhaled. Causes skin irritation. Causes serious eye irritation. May cause respiratory irritation.
Precautionary Statements: P210u-P261-P280-P305+P351+P338-P405-P501a
Keep away from heat/sparks/open flames/hot surfaces. - No smoking. Avoid breathing dust/fume/gas/mist/vapours/spray. Wear protective gloves/protective clothing/eye protection/face protection. IF IN EYES: Rinse cautiously with water for several minutes. Remove contact lenses, if present and easy to do. Continue rinsing. Store locked up. Dispose of contents/container in accordance with local/regional/national/international regulations.