[{"from": "human", "value": "Create a molecule that satisfies the conditions outlined in the description. The molecule is any one of a class of diblock copolymers with a structure consisting of a primary amino group attached to the end of a polyether backbone based on blocks of propylene oxide and ethylene oxide. Molecular weights are typically of the order of 600-2000. The compounds are used in protein crystallisation. It has a role as a crystallisation adjutant."}, {"from": "gpt", "value": "[C][C][Branch1][#Branch1][C][O][C][C][O][C][N]"}]