[{"from": "human", "value": "Based on the given information, design a molecule that meets the desired specifications. The molecule is a pyrimidine base found in DNA and RNA that pairs with guanine."}, {"from": "gpt", "value": "[C][=C][Branch1][#Branch2][N][C][=Branch1][C][=O][N][=C][Ring1][#Branch1][N]"}]