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

1GLUTARALDEHYDE
2GLUTARDIALDEHYDE
3GLUTARIC DIALDEHYDE
41,3-DIFORMYLPROPANE
5GLUTARAL
6GLUTARIC ACID DIALDEHYDE
71,5-PENTANEDIONE
8PENTANEDIAL