[{"from": "human", "value": "Use the given information to create a molecule that fulfills the desired purpose. The molecule is a steroid aldehyde that is any steroid which is substituted by a formyl group at position 4."}, {"from": "gpt", "value": "[C][C][C][C][C][C][Ring1][Branch1][C][C][C][C][C][Branch1][P][C][C][C][C][Ring1][=Branch1][Branch1][Branch2][C][Ring1][#Branch2][C][C][Ring1][P][C][C][=O]"}]