"14697779"^^; "de Ligt RA, van der Klein PA, von Frijtag Drabbe Künzel JK, Lorenzen A, Ait El Maate F, Fujikawa S, van Westhoven R, van den Hoven T, Brussee J, IJzerman AP.: Synthesis and biological evaluation of disubstituted N6-cyclopentyladenine analogues: the search for a neutral antagonist with high affinity for the adenosine A1 receptor. Bioorg Med Chem, Volume 12 (1), 2004"^^; "10.1016/j.bmc.2003.10.023"^^; .