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

13-ISOPROPYLMALIC ACID
22-HYDROXY-3-ISOPROPYLSUCCINIC ACID
33-CARBOXY-2-HYDROXY-4-METHYLPENTANOIC ACID
42-HYDROXY-3-(PROPAN-2-YL)BUTANEDIOIC ACID