preferred_name: L-cystine + 2 glycine => L-cystine-bis-glycine + 2 H2O
preferred_name_lc: l-cystine + 2 glycine => l-cystine-bis-glycine + 2 h2o
label: L-cystine + 2 glycine => L-cystine-bis-glycine + 2 H2O
label_lc: l-cystine + 2 glycine => l-cystine-bis-glycine + 2 h2o