[{"from": "human", "value": "What can you tell me about this molecule? [C][#C][C][=C][N][C][=Branch1][C][=O][N][C][Ring1][#Branch1][=O]"}, {"from": "gpt", "value": "The molecule is an orally-active fluoropyrimidine analogue. Eniluracil inhibits dihydropyrimidine dehydrogenase, the rate-limiting enzyme that catabolizes and inactivates 5-fluorouracil (5-FU) in the liver. Co-administration of ethynyluracil permits the oral administration of 5-FU."}]