Monomethylamine (MMA) is a basic alkylamine and the simplest primary amine. It is a colorless gas co-produced with dimethylamine (DMA) and trimethylamine (TMA). It has a strong ammoniacal or fishy odor. MMA is sold as an anhydrous gas in pressurized cylinders or as aqueous solution. It is a building block used in synthesis of many other commercial chemicals.