THE PRESENT INVENTION PROVIDES AN 8-OXOADENINE COMPOUND HAVING IMMUNEMODULATING ACTIVITIES SUCH AS AN INTERFERON INDUCING ACTIVITY AND USEFUL AS AN ANTIVIRAL AGENT AND ANTIALLERGIC AGENT, WHICH IS REPRESENTED BY THE FOLLOWING FORMULA (1): [WHEREIN THE RING A REPRESENTS A 6-10 MEMBERED AROMATIC CARBOCYCLIC RING AND THE LIKE, R REPRESENTS A HALOGEN ATOM, AN ALKYL GROUP AND THE LIKE, N REPRESENTS AN INTEGER OF 0-2, Z¹ REPRESENTS ALKYLENE, X² REPRESENT S OXYGEN ATOM, SULFUR ATOM, SO₂, NR⁵, CO, CONR⁵, NR⁵CO AND THE LIKE, Y¹, Y² AND Y³ REPRESENT INDEPENDENTLY A SINGLE BOND OR AN ALKYLENE GROUP, X¹ REPRESENTS OXYGEN ATOM, SULFUR ATOM, NR⁴ (R⁴ IS HYDROGEN ATOM OR AN ALKYL GROUP) OR A SINGLE BOND, R² REPRESENTS A SUBSTITUTED OR UNSUBSTITUTED ALKYL GROUP, R¹ REPRESENTS HYDROGEN ATOM, HYDROXY GROUP, AN ALKOXY GROUP, AN ALKOXYCARBONYL GROUP OR A HALOALKYL GROUP]OR ITS PHARMACOLOGICALLY ACCEPTABLE SALT.
