[{"from": "human", "value": "Based on the given information, design a molecule that meets the desired specifications. The molecule is conjugate acid of (S)-piperazine-2-carboxamide arising from selective protonation at the 4-position. It is a conjugate acid of a (S)-piperazine-2-carboxamide."}, {"from": "gpt", "value": "[C][C][N][C@@H1][Branch1][Branch1][C][NH2+1][Ring1][=Branch1][C][=Branch1][C][=O][N]"}]