preferred_name: [mycofactocin precursor peptide]-C-terminal glycyl-N-{[2-(4-hydroxyphenyl)ethenyl]-3-methylbutanamide} + 5'-deoxyadenosine + L-methionine + CO2 => [mycofactocin precursor peptide]-C-terminal glycyl-L-valyl-L-tyrosine + S-adenosyl-L-methionine