label: N-terminal N(alpha)-acetyl-L-cysteinyl-L-aspartyl-[protein] + H2O => N-terminal L-aspartyl-[protein] + N-acetyl-L-cysteine
label_lc: n-terminal n(alpha)-acetyl-l-cysteinyl-l-aspartyl-[protein] + h2o => n-terminal l-aspartyl-[protein] + n-acetyl-l-cysteine