[{"from": "human", "value": "Please give me some details about this molecule. [C][C@H1][Branch1][#Branch2][C@@H1][Branch1][=Branch1][C][=Branch1][C][=O][O][N][O][C@@H1][C@@H1][Branch1][P][C@H1][Branch1][=N][C@H1][Branch1][=Branch2][C@H1][Branch1][Ring2][O][Ring1][=Branch1][C][O][O][O][N][C][=Branch1][C][=O][C]"}, {"from": "gpt", "value": "The molecule is a L-threonine derivative that is N-acetyl-alpha-D-galactosamine linked via an alpha glycosidic bond to the O at position 3 of L-threonine. It has a role as a tumour antigen. It is a non-proteinogenic L-alpha-amino acid and a L-threonine derivative."}]