[{"from": "human", "value": "Design a molecule that meets the criteria outlined in the description. The molecule is a triacyl-sn-glycerol in which the which the acyl groups at positions 1 and 2 are specified as hexadecanoyl, while that at position 3 is specified as octadecanoyl It has a role as a human blood serum metabolite and a Caenorhabditis elegans metabolite. It is a triacylglycerol 50:0 and a triacyl-sn-glycerol."}, {"from": "gpt", "value": "[C][C][C][C][C][C][C][C][C][C][C][C][C][C][C][C][C][C][=Branch1][C][=O][O][C][C@@H1][Branch2][Ring1][=Branch1][C][O][C][=Branch1][C][=O][C][C][C][C][C][C][C][C][C][C][C][C][C][C][C][O][C][=Branch1][C][=O][C][C][C][C][C][C][C][C][C][C][C][C][C][C][C]"}]