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.

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.

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.

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.

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.

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.

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.

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.

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

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

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

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

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.

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.

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.

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].

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).

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.

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.

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.

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

(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.

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.

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) .

MAO-B-IN-27 (Compound 12c), a monoamine oxidase B (MAO-B) inhibitor, exhibits a potent and selective inhibitory effect on hMAO-B, with an IC50 value of 8.9 nM, and is utilized in Parkinson's disease (PD) research [1].

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

Budipine is a low affinity, N-methyl-D-aspartate receptor antagonist,is an antiparkinsonian agent.

hMAO-B-IN-4 is a selective, reversible and blood–brain barrier (BBB) penetrable inhibitor of human monoamine oxidase-B (hMAO-B, IC50=0.067 μM, Ki= 0.03 μM, hMAO-A, IC50= 33.82 μM).

Glicoricone acts as a partial estrogen antagonist. Glicoricone inhibited the monoamine oxidase with the IC50 values of 6.0 x 10(-5)-1.4 x 10(-4) M.

Cudratricusxanthone A has potent anti-proliferative, antioxidative, and monoamine oxidase inhibitory effects, it also possesses anti-cancer activities and provide a basis for developing effective therapeutic agents to inhibit growth and metastasis of brea

Bifemelane hydrochloride is a MAO inhibitor

ETAP, a dual inhibitor of both monoamine oxidase A (MAO-A) and monoamine oxidase B (MAO-B), exhibits antidepressant-like effects and is utilized in the research of major depressive disorder [1].

MAO-IN-3 (Compound 5), a reversible and competitive monoamine oxidase (MAO) inhibitor with inhibition constants (K i) of 0.6 μM for MAO A and 0.2 μM for MAO B, effectively suppresses LN-229 glioblastoma cell proliferation, as denoted by an inhibitory concentration (IC50) of 0.8 μM. This compound holds potential application in cancer research [1].

SL-25.1188 is a monoamine oxidase B (MAO-B) inhibitor. SL-25.1188 is characterized by reversible binding, high brain uptake, and very slow plasma metabolism in vivo.

Benmoxin is a monoamine oxidase inhibitor (MAOI) that is irreversible and nonselective.

Echitovenidine shows monoamine oxidase inhibitor activity.