You are a chemist. Now you are given a description of a molecule. Please generate a molecule that meets the description.
system
Come up with a molecule based on the description: The molecule is anti tumor.
user
CC(=O)OC12COC1CC(OC(=O)OCC(Cl)(Cl)Cl)C1(C)C(=O)C(OC(=O)OCC(Cl)(Cl)Cl)C3=C(C)C(OC(=O)C(O)C(NC(=O)OC(C)(C)C)c4ccccc4)CC(O)(C(OC(=O)c4ccccc4)C21)C3(C)C
assistant