label: beta-D-mannopyranosyl-(1->2)-D-mannopyranose + alpha-D-mannopyranose => beta-D-Manp-(1->2)-beta-D-Manp-(1->2)-D-Manp + H2O
label_lc: beta-d-mannopyranosyl-(1->2)-d-mannopyranose + alpha-d-mannopyranose => beta-d-manp-(1->2)-beta-d-manp-(1->2)-d-manp + h2o