[{"from": "human", "value": "Provide a description of this molecule. [C][C][=C][N][=C][C][=Branch1][C][=O][N][C][=Branch1][C][=O][N][=C][Ring1][Branch2][N][Ring1][N][C][C][O]"}, {"from": "gpt", "value": "The molecule is a pteridine that is lumazine substituted with a 2-hydroxyethyl group at position 8 and a methyl group at position 7; one of 20 modifications to the potent microbial riboflavin-based metabolite antigen 5-(2-oxopropylideneamino)-6-D-ribityl aminouracil (5-OP-RU), an activator of mucosal-associated invariant T (MAIT) cells when presented by the MR1 protein (reported in MED:32123373). It is functionally related to a lumazine."}]