5A6B:
reference: A Second beta-Hexosaminidase Encoded in the Streptococcus pneumoniae Genome Provides an Expanded Biochemical Ability to Degrade Host Glycans., Robb M, Robb CS, Higgins MA, Hobbs JK, Paton JC, Boraston AB, J Biol Chem. 2015 Dec 25;290(52):30888-900. doi: 10.1074/jbc.M115.688630. Epub, 2015 Oct 21. PMID: 26491009

This OCA Structure page
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