Table 1.

In Vitro affinity constants reported as mean ± error values as determined by the NIMH PDSP using [³H]QNB (literature values in parentheses [11])^*.

Compound	M1 (nM)	M2 (nM)
FP-TZTP	59.0 ± 4.6 (7.4)	38 ± 3.2 (2.2)
P-TZTP	51 ± 4.0 (23)	24 ± 1.9 (1.5)
F3P-TZTP	119 ± 9.45	112 ± 14.9

^*[³H]Piperizepine was used with bovine striatal membranes for M1 and [³H]AF-DX384 was used for rat heart membranes for M2 in the literature [11].