5-Amino-1MQ (5-amino-1-methylquinolinium) is a small-molecule quinolinium derivative and a selective, substrate-competitive inhibitor of nicotinamide N-methyltransferase (NNMT). It is most commonly supplied as the iodide salt, with the molecular formula C₁₀H₁₁IN₂, a molecular weight of approximately 286.11 g/mol, and CAS number 42464-96-0. The active cation (C₁₀H₁₁N₂⁺) consists of a methylated quinolinium ring bearing a 5-amino substituent. Supplied as a yellow to off-white crystalline powder, soluble in water and DMSO, stored refrigerated at 2–8 °C. This product is strictly for research purposes only.