[{"from": "human", "value": "Synthesize a molecule that matches the given characteristics. The molecule is the L-enantiomer of leucinium. It has a role as an Escherichia coli metabolite, a Saccharomyces cerevisiae metabolite and a plant metabolite. It is a conjugate acid of a L-leucine. It is an enantiomer of a D-leucinium."}, {"from": "gpt", "value": "[C][C][Branch1][C][C][C][C@@H1][Branch1][=Branch1][C][=Branch1][C][=O][O][NH3+1]"}]