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

1L-LEUCINE
2L-LEUZIN
3(S)-LEUCINE
4(S)-(+)-LEUCINE
5L-LEUCIN
6(2S)-2-AMINO-4-METHYLPENTANOIC ACID
7LEU
8L
9(2S)-ALPHA-2-AMINO-4-METHYLVALERIC ACID
10(2S)-ALPHA-LEUCINE
112-AMINO-4-METHYLVALERIC ACID
12LEUCINE