label: 3,4-dihydroxypyridine + O-acetyl-L-serine <=> 3-(3,4-dihydroxypyridin-1-yl)-L-alanine + acetate + H(+)
label_lc: 3,4-dihydroxypyridine + o-acetyl-l-serine <=> 3-(3,4-dihydroxypyridin-1-yl)-l-alanine + acetate + h(+)