[{"from": "human", "value": "Provide a brief overview of this molecule. [C][C@H1][C@@H1][Branch2][#Branch2][#Branch1][C@@H1][Branch1][Ring2][S][Ring1][Branch1][C][C][C][C][C][=Branch1][C][=O][N][C][C][O][C][C][O][C][C][O][C][C][O][C][C][O][C][C][O][C][C][C][=Branch1][C][=O][N][C][C][C][O][C@@H1][C@@H1][Branch2][#Branch1][Branch1][C@H1][Branch2][=Branch1][S][C@H1][Branch1][=Branch2][C@H1][Branch1][Ring2][O][Ring1][=Branch1][C][O][O][C@@H1][C@@H1][Branch2][Branch1][=C][C@H1][Branch2][Branch1][=Branch2][C@H1][Branch1][=Branch2][C@H1][Branch1][Ring2][O][Ring1][=Branch1][C][O][O][C@@H1][C@@H1][Branch2][Ring2][#Branch1][C@H1][Branch2][Ring2][C][C@H1][Branch1][=Branch2][C@H1][Branch1][Ring2][O][Ring1][=Branch1][C][O][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][O][N][O][N][O][N][N][C][=Branch1][C][=O][N][Ring2][#Branch1][=Branch1]"}, {"from": "gpt", "value": "The molecule is a tetrasaccharide derivative in which alpha-D-galactosaminyl-(1->4)-alpha-D-galactosaminyl-(1->4)-alpha-D-galactosaminyl-(1->4)-alpha-D-galactosamine is linked glycosidically to biotin via a (21-oxo-3,6,9,12,15,18-hexaoxa-22-azapentacosan-1-yl)amino spacer. One of a set of synthesised biotinylated oligo-alpha-(1->4)-D-galactosamines comprising from two to six monosaccharide units, along with their N-acetylated derivatives (PMID:31913631), aimed at analysing the specificity of the antibody responses to a complex exopolysaccharide galactosaminogalactan found in Aspergillus fumigatus, the most important airborne human fungal pathogen in industrialized countries. It is a member of biotins and a tetrasaccharide derivative."}]