SLC6A2 and psychiatric disorder: In our previous study, Δ3,2-hydroxybakuchiol (Figure 1), isolated from Fructus Psoraleae, fruit of Psoralea corylifolia (L.), which was documented in ancient Chinese medical books as one of mental disorder therapeutic herbs [5], was confirmed as an active compound that acted as monoamine reuptake inhibitor (potent for DA/NE uptake and mild for 5-HT uptake) in rodent CHO cell line overexpressing rat dopamine transporter (DAT), norepinephrine transporter (NET), or serotonin transporter (SERT) [6], preliminarily demonstrating that it may be trimonoamine transporter inhibitor.