| abstract |
(57) [Summary] [PROBLEMS] To synthesize a novel purine derivative and selectively select PD The present invention has found compounds that inhibit EIV, and further provides pharmaceutical compositions containing these compounds as active ingredients. SOLUTION: The following general formula (I): (Wherein, R 1 , R 2 and R 3 each independently represent a hydrogen atom or a C 1 -C 6 alkyl group optionally substituted with a lower alkyloxy group or an acyl group; n represents 2, 3 or 4) or a pharmacologically acceptable salt thereof. |