| abstract |
(57) [Summary] The present invention provides a compound represented by the following formula: ＢIn the formula, B is Wherein R 1 is hydrogen or a lower alkyl group; R 2 is hydrogen or a lower alkyl group; X is hydrogen or a hydroxy protecting group, respectively. A is a lower alkanoyl group or a hydroxyimino (lower) alkyl group; A is a lower alkylene group; W is a heterocyclic group or a carbocyclic group, each of which has one or more substituents. Z is imidazolyl, triazolyl, imidazopyridyl and adenyl, each of which may have one or more substituents, a heterocyclic group selected from the group consisting of Where W is an aryl group optionally having one or more substituents, (i) Z is a triazolyl group, an imidazopyridyl group or an adenyl group, each of which is (Ii) Z is an imidazolyl group optionally having one or more substituents, and B is lower alkanoyl Or hydroxyimino (lower) alkyl group, or (iii) Z is one or more of which may have a substituent imidazolyl group, R 1 and R 2 are a lower alkyl group is there. The present invention relates to a heterocyclic compound represented by｝ or a pharmaceutically acceptable salt thereof, and is useful as a medicament. |