daily dose. Chemical forms Harmine: C13H12N2O 7-Methoxy-1-methyl-9H-pyrido[3,4-b]indole Harmine is a reversible inhibitor of monoamine oxidase A (RIMA). Harmaline: C13H14N2O 4,9-Dihydro-7-methoxy-1-methyl-3H-pyrido[3,4-b]indole Harmaline is also a RIMA. Harmalol: C12H12N2O 1-Methyl-4,9-dihydro-3H-pyrido[3,4-b]indol-7-ol Tetrahydroharmine: C13H16N2O 1,2,3,4-tetrahydro-harmine Harmalane: C12H10N2 1-Methyl-3,4-dihydro-beta-carboline. Harmalan occurs in foodstuffs. Isoharmine: C13H12N2O Harmine acid methyl ester: Methyl 7-methoxy-beta-carboline-1-carboxylate Harmilinic acid: 7-Methoxy-3,4-dihydro-beta-carboline-1-carboxylic acid Harmanamide: 1-Carbamoyl-7-methoxy-beta-carboline Acetylnorharmine: 1-Acetyl-7-methoxy-beta-carboline See also Harmane Beta-carboline (norharmane) Monoamine oxidase inhibitor Reversible inhibitor of monoamine oxidase A (RIMA) References External links Tetrahydroharmine entry in TiHKAL • info Harmala Alkaloid - an Overview Alkaloids by type of organism Ayahuasca Monoamine oxidase inhibitors Nitrariaceae