| abstract |
A stabilized physiologically active benzimidazole derivative having the formula (I):n wherein R¹ is hydrogen atom, an alkyl group having 1 to 8 carbon atoms, a fluoroalkyl group having 1 to 6 carbon atoms, a cycloalkyl group, phenyl group or an aralkyl group, R² is hydrogen atom or a lower alkyl group, or R¹ and R² together with the adjacent nitrogen atom form a ring, and each of R 3a , R 3b , R 4a , R 4b and R 4c independently is hydrogen atom, a halogen atom, a flouroalkyl group having 1 to 6 carbon atoms, a lower alkyl group, a lower alkoxy group, a lower alkoxycarbonyl group or an amino group. The stabilized benzimdazole derivative is in amorphous form or present in contact with a basic material. |