A-437203 (Lu201640) is A kind of based on 1 h - pyrimidin - 2 - one sca ff old, selective, new powerful d3 receptor antagonist, on D2, d3, and D4 receptor, Ki value 71, respectively 1.6 and 6220 nM.

D2 receptor:71 nM (Ki), D4 receptor:6220 nM , D3 receptor:1.6 nM

Male Sprague-Dawley rats weighing 250-350 g are used for these experiments. Haloperidol (0.27, 1.33, and 2.66 μmol/kg=0.1, 0.5, and 1.0 mg/kg i.p.), A-437203 (LU-201640) (0.52, 1.75, 5.24, and 17.46 μmol/kg=0.3, 1.0, 3.0, and 10.0 mg/kg i.p.), and L-745,870 (0.23, 1.15, 2.3, and 5.7 μmol/kg=0.1, 0.5, 1.0, and 2.5 mg/kg i.p.) are tested initially alone in order to determine effective dose ranges. In those experiments, haloperidol, A-437203, and L-745,870 are administered i.p. 24, 5, and 0.5 h before the test swim. In the subsequent antagonism experiments, Haloperidol (0.27 μmol/kg), A-437203 (17.46 μmol/kg) or L-745,870 (1.15 μmol/kg) are injected i.p. 15 min prior to each quinpirole injection (0.4 and 1.0 μmol/kg s.c.).

DMSO: 60 mg/mL (131.43 mM), Sonication is recommended.