[{"from": "human", "value": "Generate a molecule based on the given description. The molecule is a C20 phytoceramide in which the ceramide N-acyl group is specified as octacosanoyl. It is a C20 phytoceramide and a N-(ultra-long-chain-acyl)-sphingoid base."}, {"from": "gpt", "value": "[C][C][C][C][C][C][C][C][C][C][C][C][C][C][C][C][C][C][C][C][C][C][C][C][C][C][C][C][=Branch1][C][=O][N][C@@H1][Branch1][Ring1][C][O][C@@H1][Branch2][Ring1][Branch1][C@@H1][Branch1][P][C][C][C][C][C][C][C][C][C][C][C][C][C][C][C][C][O][O]"}]