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

1L-SERINE
2(2S)-2-AMINO-3-HYDROXYPROPANOIC ACID
3(S)-SERINE
4(S)-2-AMINO-3-HYDROXYPROPANOIC ACID
5L-(-)-SERINE
6SERINE
7(S)-(-)-SERINE
8L-SERIN
9SER
10S
11L-2-AMINO-3-HYDROXYPROPIONIC ACID
12L-3-HYDROXY-ALANINE