Harmine 50MG. Harmine, A MAO-A and DYRK inhibitor, CAS Number: 442-51-3, Molecular Formula: C13H12N2O, Molecular Weight: 212. 25, Purity: greater than or equal to 98% by titration, Appearance: White to off-white solid, Synonym: 7-Methoxy-1-methyl-9H-pyrido[3, 4-b]indole, Size: 50MG