An adenine compound represented by the formula (1): (1) [wherein A
1
and A
2
each independently represents an (un)substituted aromatic carbocycle or (un)substituted aromatic heterocycle; L
1
, L
2
, and L
3
each independently represents alkylene or a single bond, provided that any methylene or methine group in L
2
or L
3
may be bonded to the nitrogen atom adjacent to L
2
and L
3
to form a 4- to 7-membered saturated nitrogenous heterocycle; L
4
represents alkylene or a single bond; R
1
represents (un)substituted alkyl, (un)substituted aryl, etc.; R
2
represents hydrogen or (un)substituted alkyl; R
3
represents (un)substituted alkyl, etc.; and X represents oxygen, etc.] or a pharmaceutically acceptable salt of the compound. The compound and salt are useful as a medicine.
An adenine compound useful for a medicament represented by the following formula (1):
, wherein A1 and A2 are independently, optionally substituted cyclic aromatic hydrocarbon group or optionally substituted aromatic heterocyclic group;
L1, L2 and L3 are independently, alkylene or a single optionally substituted alkylene or a single bond, and any methylene or methyne in L2 or L3 may be bound with N atom adjacent to L2 and L3 to form 4 to 7 membered saturated hetero ring containing N atom;
L4 is alkylene or a single bond;
R1 is optionally substituted alkyl group, optionally substituted alkenyl group, optionally substituted aryl group, etc.;
R2 is hydrogen atom or optionally substituted alkyl group;
R3 is optionally substituted alkyl group, etc.;
X is oxygen atom, etc.;
or its pharmaceutically acceptable salt.