The results of MCMM calculations indicated that the long chain at the position 2 of the adenine ring of the ligand is oriented toward the extracellular part of the receptor.
In the model obtained the N - (2-aminoethyl) -3- (dimethylamino) propanamide moiety was located between the extracellular parts of TM4 and TM5 of the A 2A AR.