Crystals of penicillin and process for the production thereof
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United States of America Patent
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Dec 9, 2003
Grant Date -
Dec 19, 2002
app pub date -
Apr 8, 2002
filing date -
Aug 11, 2000
priority date (Note) -
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Abstract
The crystal of the invention is crystal of diphenylmethyl 2-methyl-2-triazolylmethylpenam-3-carboxylate which is stable substantially without decomposition or degradation of properties even when left to stand at room temperature for 1 year. The crystal of the invention can be prepared by a process comprising the steps of concentrating a solution containing diphenylmethyl 2-methyl-2-triazolylmethylpenam-3-carboxylate represented by the formula (2) ##STR1## wherein Ph is a phenyl group, diluting the concentrate with acetic ester and mixing the diluted solution with hexane or a solvent mixture of hexane and acetic ester to crystallize the diphenylmethyl 2-methyl-2-triazolylmethylpenam-3-carboxylate.
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