Hassanein A A, Turpie A G, McNicol G P, Douglas A S
Br Med J. 1970 Apr 11;2(5701):83-6. doi: 10.1136/bmj.2.5701.83.
RA233, a new pyrimido-pyrimidine compound, is a powerful inhibitor of platelet function tested in vitro; it inhibits calcium and adenosine diphosphate (A.D.P.)-induced platelet aggregation, inhibits the retention of platelets by glass beads, decreases the release of platelet factor 3 by kaolin, and inhibits clot retraction. In some in-vitro systems RA233 is significantly more potent that its analogue RA433 in inhibiting platelet function.