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

1(S)-1,2-DISTEAROYLPHOSPHATIDYLETHANOLAMINIUM
2(7S)-4-HYDROXY-7-(OCTADECANOYLOXY)-10-OXO-3,5,9-TRIOXA-4-PHOSPHAHEPTACOSAN-1-AMINIUM 4-OXIDE
3PHOSPHATIDYLETHANOLAMINE
4(1S)-2-{[(2-AMINOETHOXY)(HYDROXY)PHOSPHORYL]OXY}-1-[(STEAROYLOXY)METHYL]ETHYL (5E,8E,11E,14E)-ICOSA-5,8,11,14-TETRAENOATE
52-ARACHIDONOYL-1-STEAROYL-SN-GLYCEROL-3-PHOSPHOETHANOLAMINE