Can anybody explain why the ligand_id for 5JER is called 'III'? It appears that 'III' is used by PDB to represent a different ligand (see https://www.rcsb.org/ligand/III). The actual ligand on 5JER is 'Rotavirus NSP1 peptide' containing 19-amino acids.
I tried to look up information for 'III' but the following URL returns a '500 internal server error':
https://zhanglab.ccmb.med.umich.edu/BioLiP/qsearch.cgi?lig3=III
Thanks.