[{"from": "human", "value": "Create a molecule that satisfies the conditions outlined in the description. The molecule is a nucleobase analogue that is uracil substituted with a (1,2-dideoxy-D-ribityl)amino group at position 6 and an (E)-(2-oxopropylidene)amino group at position 5; 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 has a role as an epitope. It is a pyrimidone and a nucleobase analogue. It is functionally related to a uracil."}, {"from": "gpt", "value": "[C][C][=Branch1][C][=O][C][=N][C][=C][Branch1][O][N][C][=Branch1][C][=O][N][C][Ring1][#Branch1][=O][N][C][C][C@@H1][Branch1][#Branch1][C@@H1][Branch1][Ring1][C][O][O][O]"}]