bi is the relative umami concentration (RUC) for each umami amino acid to MSG (Glu, 1 and Asp, 0.077); bj is the RUC for each umami 5′-nucleotide to 5′-IMP (5′-IMP, 1 and 5′-GMP, 2.3); 1218 is a synergistic constant, based on the concentration of g per 100 g used.