7-Hydroxy-3,4-dihydro-2(1H)-quinolinone 是弱MAO-A 抑制剂，IC50=183 μM，对 MAO-B 无作用。

AnnH31 是一种有效的 Dyrk1A 抑制剂 ，IC50 值为 81 nM。AnnH31 对 MAO-A 有抑制作用，IC50 为 3.2 μM。AnnH31 可作为探针，用于确认 DYRK1A 参与细胞磷酸化。

Esuprone (LU-43839) 是一种新型可逆且具有高选择性的MAO-A 抑制剂，具有抗惊厥活性，可用于治疗抑郁症。

SAR-629 is an MGL inhibitor or 2-AG degradation inhibitor.

Benserazide is an inhibitor of dopa decarboxylase. It is often given with levodopa in the treatment of Parkinson's to prevent the conversion of levodopa to dopamine in the periphery, thereby increasing the amount that reaches the central nervous system an

PF-04449613 is a phosphodiesterase 9A (PDE9A) inhibitor (IC50= 22 nM).1It is selective for PDE9A over PDE1C (IC50= >1,000 nM), as well as over a variety of other PDEs, inhibiting PDE2-8, -10, and -11 activity by less than 30% in a panel of enzymes, ion channels, and transporters at 1 μM but does inhibit the human dopamine transporter (DAT; Ki= 293 nM). PF-04449613 (0.1-100 mg/kg, s.c.) increases cerebrospinal fluid (CSF) levels of cyclic GMP (cGMP) in rats. Subcutaneous administration of PF-04449613 (10 mg/kg) increases the rate of dendritic spine formation and elimination in mouse primary motor cortex pyramidal neuronsin vivo.2It increases the average running speed of mice in an accelerating rotarod task, indicating improved motor learning, at the same dose. 1.Claffey, M.M., Helal, C.J., Verhoest, P.R., et al.Application of structure-based drug design and parallel chemistry to identify selective, brain penetrant, in vivo active phosphodiesterase 9A inhibitorsJ. Med. Chem.55(21)9055-90