label: (R)-N-acetyl-S-methyl-L-cysteine sulfoxide + FMN + H2O + H(+) => N-acetyl-S-methyl-L-cysteine + FMNH2 + O2
label_lc: (r)-n-acetyl-s-methyl-l-cysteine sulfoxide + fmn + h2o + h(+) => n-acetyl-s-methyl-l-cysteine + fmnh2 + o2