Abstract: A heterocyclic compound represented by the general formula (In the formula, R1, R2 and R3 may be the same or different, and each represents a hydrogen atom, a halogen atom, or this general formula (X1—Y1—R4) (in the formula: X1 represents this general formula (NR5) (in the formula, R5 represents a hydrogen atom, etc.) or the like; Y1 represents an optionally substituted C1-6 alkylene group or the like; and R4 represents an optionally substituted aryl group or the like), and Z represents a nitrogen atom or this general formula (CR6) (in the formula, R6 represents a hydrogen atom, a halogen atom, or an optionally substituted C1-12 alkyl group or the like)), or a salt thereof, exhibits excellent anti-HIV activity and is useful as an anti-HIV agent.

Abstract: A heterocyclic compound of formula (I) or a salt thereof: wherein R1 is an optionally protected amino group or an optionally substituted C1-6 alkyl group; R2 and R3 are each independently a C1-2 alkyl group; X is a hydrogen atom or a halogen atom; Z1 is N or C—R4; Z2 is N or C—R5; Z3 is N or C—R6; Z4 is N or C—R7; R4, R5, R6, and R7 are each independently a hydrogen atom, a halogen atom, an optionally protected amino group, or a C1-6 alkylsulfonyl group; Z is CH or N; and A is a methylene group or a bond, which has an excellent anti-HIV activity and is useful as an anti-HIV agent.