CH3NH3HCO3 → X1 → (CH3)2NH2Br → X3 → (CH3)3NHCl → C5H13NO2

The reaction sequence shows the alkylation of amines. CH3NH3HCO3 likely represents methylammonium bicarbonate. Heating this would lead to methylamine (CH3NH2). Methylamine reacts with CH3Br to form dimethylamine ((CH3)2NH). Further reaction with CH3Br yields trimethylamine ((CH3)3N). The final product C5H13NO2 is likely N,N-dimethyl-2-propanamine oxide, formed by oxidation of trimethylamine with H2O2. The reaction with HCOOH produces X2, which is likely formamide (HCONH2).