Krysztaly (R)- lub (S)-2-[[[3-metylo-4-(2,2,2-trifluoroetoksy)-2-pirydynylo]metylo]sulfinylo]-1H-benzimidazolu, kompozycja farmaceutyczna zawierajaca te krysztaly i ich zastosowanie
The present invention relates to a production method of a crystal of (R)-lansoprazole or (S)-lansoprazole, which includes crystallization at a temperature of about 0°C to about 35°C from a C1-4 alkyl acetate solution containing (R)-lansoprazole or (S)-lansoprazole at a concentration of about 0.1 g/mL to about 0.5 g/mL and the like. According to the production method of the present invention, a crystal of (R)-lansoprazole or (S)-lansoprazole superior in preservation stability can be produced efficiently on an industrial large scale.
