Dimitrakis, S. Gavriil, E.-S. Pousias, A. Lougiakis, N. Marakos, P. Pouli, N. Gioti, K. Tenta, R., Novel Substituted Purine Isosteres: Synthesis, Structure-Activity Relationships and Cytotoxic Activity Evaluation, Molecules, (27), 2022, MDPI, 1420-3049