metfendrazine metfendrazine metfendrazine (hm-11, mo-482), also known as methphendrazine, is an irreversible and nonselective monoamine oxidase inhibitor (maoi) of the hydrazine chemical class. it was investigated as an antidepressant, but was never marketed. metfendrazineclinical dataroutes ofadministrationoralatc codenonelegal statuslegal status in general: uncontrolled identifiers iupac name 1-methyl-1-(1-methyl-2-phenyl-ethyl)hydrazine cas number3734-26-7 ypubchem cid19516chemspider18390uniia52qtc656tchemical and physical dataformulac10h16n2molar mass164.252 g·mol−1