Table 1.

Inhibitory effect of the compounds isolated from Mitrephora vulpina on PAF receptor binding to rabbit platelets at 18.2 µg/mL and their IC₅₀ values.

Sample	% inhibition	IC50 (µM)
Oxoputerine	34.6 ± 6.5
Liriodenine	27.7 ±2.7
Stigmasterol	25.7 ± 4.1
Phylligenine	75.2 ± 7.3*	13.1 ± 2.5 (4.8 ± 0.4)
Quebrachitol	65.5 ± 5.0*	42.2 ± 1.6 (8.2 ± 1.1)
Cedrol	78.0 ± 1.8	10.6 ± 1.2 (2.5 ± 0.2)

Values are calculated from at least three experiments and presented as means ± SD. *P < 0.05 as compared with cedrol. The IC₅₀ values in µg/mL are presented in parentheses.