| 摘要 |
Disclosed is a novel compound having an anti-viral activity, particularly an inhibitory activity on HIV integrase. Also disclosed is a pharmaceutical, particularly an anti-HIV agent, comprising the compound. The compound is represented by the formula (I): (I) wherein R1 represents a hydrogen or a lower alkyl; X represents a lower alkylene or the like; R2 represents an aryl which may be substituted; R3 represents a hydrogen, a halogen, a hydroxy, or the like; R4 represents a hydrogen, a lower alkyl group which may be substituted or the like; the broken line represents the presence or absence of a bond; one of B1 and B2 represents CR20R21 and the other represents NR22 wherein no broken line is present, or B1 and B2 independently represent C, CR23 or N wherein the B1 moiety and the B2 moiety may together form a heterocyclic ring which may be substituted; and R20, R21, R22 and R23 independently represent a hydrogen, a lower alkyl which may be substituted, a cycloalkyl which may be substituted, a cycloalkyl(lower)alkyl which may be substituted or the like.
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