preferred_name: 2 N-acetyl-D-glucosamine => N,N'-diacetylchitobiose + H2O
preferred_name_lc: 2 n-acetyl-d-glucosamine => n,n'-diacetylchitobiose + h2o
label: 2 N-acetyl-D-glucosamine => N,N'-diacetylchitobiose + H2O
label_lc: 2 n-acetyl-d-glucosamine => n,n'-diacetylchitobiose + h2o