[{"from": "human", "value": "Design a molecule that meets the criteria outlined in the description. The molecule is a Histamine-2 Receptor Antagonist. The mechanism of action of cimetidine is as a Histamine H2 Receptor Antagonist."}, {"from": "gpt", "value": "[C][C][=C][Branch1][=Branch1][N][=C][N][Ring1][Branch1][C][S][C][C][N][C][=Branch1][Ring1][=N][C][N][C][#N]"}]