2 N-acetyl-D-glucosamine => N,N'-diacetylchitobiose + H2O
2 n-acetyl-d-glucosamine => n,n'-diacetylchitobiose + h2o
2 N-acetyl-D-glucosamine => N,N'-diacetylchitobiose + H2O
2 n-acetyl-d-glucosamine => n,n'-diacetylchitobiose + h2o