[{"from": "human", "value": "Generate a molecule based on the given description. The molecule is a copolymer composed of 2-hydroxypropanoyl and 2-hydroxyacetyl units. It is a copolymer macromolecule and a polyester macromolecule."}, {"from": "gpt", "value": "[C][C][Branch1][=Branch1][C][=Branch1][C][=O][O][O][C][=Branch1][C][=O][C][O]"}]