Index PDB ID Protein Name Organism UniProt ID Ligand Name Canonical SMILES HET Code 1 1NBP Interleukin-2 Homo sapiens (Human) P60568 N-[3‐[(2‐aminoethyl)disulfanyl]-1-oxopropyl]-tetrahydro-beta-carboline NCCSSCCC(=O)N1CCc2c(C1)[nH]c1ccccc21 MHC