L-cystine + 2 glycine => L-cystine-bis-glycine + 2 H2O
l-cystine + 2 glycine => l-cystine-bis-glycine + 2 h2o
L-cystine + 2 glycine => L-cystine-bis-glycine + 2 H2O
l-cystine + 2 glycine => l-cystine-bis-glycine + 2 h2o