an S-substituted L-cysteine + acetate => an N-acetyl-L-cysteine-S-conjugate + H2O
an s-substituted l-cysteine + acetate => an n-acetyl-l-cysteine-s-conjugate + h2o
an S-substituted L-cysteine + acetate => an N-acetyl-L-cysteine-S-conjugate + H2O
an s-substituted l-cysteine + acetate => an n-acetyl-l-cysteine-s-conjugate + h2o