The name/synonym for ligand M6D (curated from ChEBI, PubChem, and PDB databases):

1BETA-D-MANNOSE 6-PHOSPHATE
2BETA-D-MANNOPYRANOSE 6-(DIHYDROGEN PHOSPHATE)
36-O-PHOSPHONO-BETA-D-MANNOPYRANOSE
4BETA-D-MANNOSE-6-PHOSPHATE