474 (C) (H) (N O) (CHNO content (%)) Buswell (Buswell Mueller, 1952) CnHaObNc+ H2O CH4 (10.16) n a b c (10.16) 14 C5H7O2N 1 mol n=5,a=7,b=2,c=1 C5H7O2N+ H2O CH4 + CO2 + cNH3