introduction to 4,4′-diaminodimethane 4,4′-diaminodimethane (mda, full name 4,4′-methylenebis (phenylamine)), is an important organic compound and belongs to the class of aromatic amines in chemical structure. it is connected by two rings through a methylene bridge, each with amino functional groups on it. the molecular formula of mda is c13h14n2 and the molecular weight is 198.26...