Monoamine oxidase/Aromatase-IN-1 (compound 2q) is a potent dual inhibitor of monoamine oxidase (MAO) and aromatase, with IC50 values of 39 nM and 31 nM for MAO-B and aromatase, respectively. It holds significant potential for research in neurological disorders and breast cancer [1].

Monoamine Oxidase B inhibitor 2 is a potent, reversible, orally active and selective inhibitor of monoamine oxidase B (MAO-B) (IC50 = 1.33 nM) which can across the blood-brain barrier (BBB). Monoamine Oxidase B inhibitor 2 shows antioxidant and anti-neuroinflammatory activities which can be used in the study of Parkinson’s disease [1].

Monoamine oxidase, an enzyme comprising various polypeptides, catalyzes the oxidative deamination of diverse biological amines within both brain and peripheral tissues, yielding hydrogen peroxide in the process. This enzyme is crucial for regulating synaptic transmission, emotional behavior, and other cerebral functions [1] [2].

Monoamine Oxidase B inhibitor 1 is a potent, reversible, orally active and selective monoamine oxidase B (MAO-B) inhibitor (IC50 = 0.02 nM) that can across the blood-brain barrier (BBB). Monoamine Oxidase B inhibitor 1 shows antioxidant and anti-neuroinflammatory activities that can be used in the study of Parkinson’s disease[1].

1. Hypericin (Cyclosan) has antineoplastic activity. 2. Hypericin has antibiotic and antiviral activities. 3. Hypericin has antidepressive activity through inhibiting monoamine oxidase enzyme. 4. Hypericin inhibits RANKL-mediated osteoclastogenesis via affecting ERK signalling in vitro and suppresses wear particle-induced osteolysis in vivo.

CX-157 (KP 157) is a novel monoamine oxidase-A (MAO-A) inhibitor for the study of depression-like neurological disorders and cancer.

Safinamide mesylate (EMD 1195686 mesylate) , a mesylate salt of Safinamide, can reversibly and specifically inhibit MAO-B (IC50: 98 nM), has 5918-fold selectivity against MAO-A.

Hydroxyamine hydrochloride(Hydroxylammonium chloride) is a selective and potent monoamine oxidase (MAO) inhibitor with inhibitory effects on platelet aggregation.Hydroxyamine hydrochloridee is an intermediate in organic synthesis and can be used to synthesize other active compounds.

Ethyl 4-hydroxyphenylacetate is a selective inhibitor of monoamine oxidase A.

Paeonol (Peonol) is an active extraction from Paeonia suffruticosa. Paeonol inhibits MAO-A and MAO-B with IC50 of 54.6 μM and 42.5 μM, respectively.

MAO-B-IN-9 is a monoamine oxidase B MAO-B inhibitor (IC50: 0.18 μM) that crosses the blood-brain barrier with potency, selectivity and time-dependence. MAO-B-IN-9 has neuroprotective effects against Aβ1-42-induced neuronal cell death, which may be related to the anti-aggregation effect of Aβ1-42.

hMAO-B-IN-5 is a potent reversible and selective human monoamine oxidase hMAO-B inhibitor (IC50:0.12μM). hMAO-B-IN-5 can cross the blood-brain barrier and can be used in the study of Parkinson's disease. It is a promising compound in the treatment and diagnosis of central nervous system diseases.

PXS-5153A is an effective, selective, and fast-acting inhibitor of lysyl oxidase like 2/3 enzymes with enzymatic activity almost entirely blocked within 15 minutes. PXS-5153A could reduce crosslinks and ameliorates fibrosis.

PF-184298 is a serotonin and norepinephrine monoamine reuptake inhibitor (SNRI) that inhibits dopamine reuptake.

Desoxypeganine (Deoxypeganine) is an inhibitor of cholinesterase. It acting preferentially on butyrylcholinesterase, and as a selective inhibitor of monoamine oxidase A but not monoamine oxidase B.Desoxypeganine is being developed for its potential utility in the pharmacological treatment of alcohol abuse to reduce craving and depression in alcohol abusers, and might also be useful as a smoking cessation aid.

Tetrabenazine Metabolite ((-)-β-HTBZ), a vesicles monoamine transporter 2 (VMAT2) inhibitor, is an active metabolite of Tetrabenazine. Tetrabenazine Metabolite has a high affinity for VMAT2 with a Ki of 13.4 nM. Tetrabenazine Metabolite is often used to study chorea associated with Huntington's disease and other hyperactivity disorders.

2-((2,2-Dibenzylhydrazineylidene)methyl)pyridine (2-[(1E)-(dibenzylhydrazin-1-ylidene)methyl]pyridine) is a heterocyclic compound. It inhibits monoamine oxidase, resulting in elevated monoamine levels in the body. It can also inhibit adenosine deaminase, resulting in elevated levels of adenosine in the body. It can also increase the activity of certain neurotransmitters, including serotonin and dopamine.

NSI-189 Phosphate is a novel neurogenic molecule with pleiotropic properties, including antidepressant, procognitive, synaptoplastic, and neurotrophic activities demonstrated in preclinical studies. Its antidepressant activity is monoamine-independent.

Liafensine(BMS-820836) is a novel and selective triple monoamine reuptake inhibitor with inhibitory effects on the reuptake of serotonin, norepinephrine, and dopamine for the study of major depressive disorder and central nervous system disorders.

Ladostigil (Ladostigil free base) is an orally active dual inhibitor of cholinesterase and brain-selective monoamine oxidase (MAO) with inhibitory effects on MAO-B and AChE, with IC50 values of 37.1 and 31.8 μM, respectively.Ladostigil possesses anti-inflammatory, antioxidant, and neuroprotective activities, and may be used in studies of depression and Alzheimer's disease.

Diclofensine (Ro 8-4650) is a monoamine reuptake inhibitor that blocks dopamine (IC50=0.74 nM), norepinephrine (IC50=2.3 nM), and 5-hydroxytryptophan (IC50=3.7 nM) in synaptosomes of the rat brain. dAURK-4 hydrochloride is an inhibitor of dopamine (IC50=0.74 nM), norepinephrine (IC50=2.3 nM) and 5-hydroxytryptophan (IC50=3.7 nM).

Bazinaprine is a selective, reversible monoamine oxidase inhibitor (MAOI) that is a candidate compound for the treatment of depression. Bazinaprine showed strong inhibitory effect on type A monoamine oxidase and weak inhibitory effect on type b monoamine oxidase. Bazinaprine is reversible in vivo, but not in vitro.

PSB-1434 is a selective and competitive monoamine oxidase B inhibitor.

FFN 511 hydrochloride is a fluorescent pseudo-neurotransmitters (FFNs) targeting neuronal vesicular monoamine transporter 2 (VMA T2).FFN 511 hydrochloride inhibits the binding of 5-hydroxytryptamine to VMA T2-containing membranes and can be used for labelling of dopaminergic nerve endings in acute slices of in vivo cortex-striatum. The excitation and emission maxima are 406 and 501 nm, respectively.

2-(4-TRIFLUOROMETHYL-PHENYL)-ETHYLAMINE is a monoamine neurotransmitter. It has been studied for its potential to modulate the activity of various neurotransmitters, including serotonin, dopamine, and norepinephrine. Its potential as a 5-HT2A receptor agonist has also been studied.

FCE 28073 is a Monoamine oxidase B inibitor with IC50 of 0.45 uM.

PSB-1491 is a selective and competitive monoamine oxidase B inhibitor with IC50 of 0.386 nM, >25000-fold selective versus MAO-A.

BW-1370U87 is a reversible competitive monoamine oxidase-A inhibitor for the study of depression and other CNS disorders.

MAO-B-IN-1 is a monoamine oxidase B inhibitor and can be used for the research of neurological diseases.

Medifoxamine (LG 152) is a selective non-monoamine oxidase inhibitor that exhibits antidepressant activity through inhibition of 5 HT reuptake.Medifoxamine preferentially inhibits dopamine reuptake.

DiPT is an agonist at the 5HT2A receptor and a partial agonist at the 5HT1A receptor, and inhibits the transport of 5-hydroxytryptamine transporter and vesicular monoamine transporter 2.

Rosmarinic acid (Labiatenic acid) is widely found in plants and has antioxidant, anti-inflammatory, and antibacterial activities. It inhibits MAO-A, MAO-B, and COMT with IC50 of 50.1, 184.6, and 26.7 μM respectively.

Serotonin hydrochloride (Serotonin HCl) is an endogenous 5-HT receptor agonist, a monoamine neurotransmitter in the CNS, and a catechol O-methyltransferase (COMT) inhibitor(Ki=44 μM).

β-Aminopropionitrile (3-Aminopropionitrile) is a selective inhibitor of lysyl oxidase.

Nialamide (Nialamid) is an MAO inhibitor that is used as an antidepressive agent.

Harmane (Loturine) is a bio-active β-Carboline and monoamine oxidase inhibitor found in coffee and tobacco smoke.

PF-9601N showed high potency and selectivity as a MAO-BI (monoamine oxidase type B inhibitor) and also demonstrated remarkable neuroprotective properties in several in vivo and cellular models of PD.

Niaprazine is a histamine H1-receptor antagonist with marked sedative properties. Niaprazine has antihistamine and antiserotonin activities and can be used for sleep disorder research[1][2]. Niaprazine exhibits a low affinity for the vesicular monoamine transporter and for D2, α2, β, H1 and mAch receptors. Niaprazine, particularly the (+)stereoisomer, has a higher affinity for α1 (Ki = 77 nM) and 5-HT2 (Ki = 25 nM) binding sites, but is poorly recognized by 5-HT1A and 5-HT1B binding sites[2]. Niaprazine (60 mg/kg; i.p.; once) treatment increases rat brain 5-hydroxyindole acetic acid (5-HIAA) concentrations 30 min after treatment, and reduced them at 3-8 hr after treatment. Niaprazine also produces a short-lasting depletion of rat brain noradrenaline (NA) and dopamine (DA)[3]. Animal Model: Male Sprague-Dawley rats (150-200 g)[3] [1]. D Scherman, et al. Molecular pharmacology of niaprazine. Prog Neuropsychopharmacol Biol Psychiatry. 1988;12(6):989-1001. [2]. P G Rossi, et al. Niaprazine in the treatment of autistic disorder. J Child Neurol. 1999 Aug;14(8):547-50. [3]. P E Keane, et al. The effect of niaprazine on the turnover of 5-hydroxytryptamine in the rat brain. Neuropharmacology. 1982 Feb;21(2):163-9.

Cassiaside B2 is an inhibitor of protein tyrosine phosphatase 1B (PTP1B) and human monoamine oxidase A (hMAO-A).Cassiaside B2 is an agonist of the 5-HT2C receptor with anti-allergic activity.Cassiaside B2 is one of the active ingredients in the naphthylpyrone reference extract (NRE).

Methylene Blue (Basic Blue 9) hydrate functions as an inhibitor of guanylyl cyclase (sGC), monoamine oxidase A (MAO-A), and NO synthase (NOS). This compound, known for its vasopressor activity, is widely utilized as a dye in various medical procedures. It operates via the nitric oxide synthase/guanylate cyclase signaling pathway to diminish prepulse inhibition and possesses the capacity to cross the blood-brain barrier. Methylene Blue hydrate acts as a REDOX cycling compound and inhibits Tau protein aggregation. Moreover, it is effective in reducing cerebral edema, damping microglial activation, and alleviating neuroinflammation, demonstrating its multifaceted therapeutic potential [1] [2] [3].

2'-O-Methylperlatolic acid and confluentic acid are monoamine oxidase B inhibitors in a Brazilian plant, Himatanthus sucuuba.

Eprobemide (LIS 630) is a non-competitive reversible inhibitor of monoamine oxidase A (MAO-A).

7-Hydroxy-3,4-dihydro-2(1H)-quinolinone is a weak MAO-A inhibitor(with an IC50 of 183 μM) .

Trans (2,3)-Dihydrotetrabenazine is a Tetrabenazine metabolite, shows inhibition activity on vesicular monoamine transporter (VMAT2).

Tranylcypromine (SKF 385), a potent monoamine oxidase (MAO) inhibitor [1], is used in medicinal applications.

WAY-620147 is a derivative of N-(2-morpholinoethyl)nicotinamide, which is able to inhibit Monoamine Oxidase.WAY-620147 has an IC50 value of 26 μM for MAO-A and 55 μM for MAO-B, and can be used for the study of neurological diseases.

Xanthoangelol, which can be extracted from Angelica keiskei, inhibits obesity-induced inflammatory responses.Xanthoangelol has antimicrobial activity, inhibits monoamine oxidase, and induces apoptosis in neuroblastoma and leukemia cells.

(S)-Salsolidine, a chemical compound, functions as a weak inhibitor of monoamine oxidase (MAO), exhibiting an inhibition constant (K i ) of 63 μM. R enantiomer demonstrating a greater efficacy than (S)-Salsolidine, boasting a K i value of 26 μM compared to the S form.

Cudraflavone B has anti-proliferative activity, mouse brain monoamine oxidase (MAO) inhibitory effects, apoptotic actions in human gastric carcinoma cells and mouse melanoma cells, and hepatoprotective activity. It may be a lead for the development of a potential candidate for human oral squamous cell carcinoma cells.

Lazabemide hydrochloride (N-(2-Aminoethyl)-5-chlor-2-pyridincarbox) is a reversible and selective mao-b inhibitor(Ki：7.9nM).