In search of strongly fluorescent tricyclic analogues of acyclovir (ACV, 1) and ganciclovir (GCV, 2), derivatives of the 3, 9-dihydro-9-oxo-5 H-imidazo [1, 2-a] purine system, several 6- [4-(acyloxy) phenyl], 6-[4-(acylamino) phenyl], and 6-[4-(phenoxycarbonyloxy) phenyl]- substituted TACV and TGCV analogues were synthesized and evaluated for their activity against herpes simplex virus types 1 and 2 in cell culture. All TACV and TGCV analogues ...