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Synthesis and Pharmacological Evaluation of 2,5-Cycloamino-5H-[1]benzopyrano [4,3-d]pyrimidines Endowed with in vitro Antiplatelet Activity.-The title compounds of type (V) and (IX) are found to be inactive in vivo. Derivative (V) shows acetylsalicylic acid (ASA)-like antiplatelet activity and compound (IX) shows antiplatelet activity in vitro against all the aggregants, differing from that of ASA. -(BRUNO, O.; BRULLO, C.; RANISE, A.; SCHENONE, S.; BONDAVALLI, F.; BAROCELLI, E.; BALLABENI, V.; CHIAVARINI, M.; TOGNOLINI, M.; IMPICCIATORE, M.; Bioorg. Med.