You are a chemist. Now you are given a description of a molecule. Please generate a molecule that meets the description.
system
I give you a description of a molecule, and you need to return one molecule in SMILES that meets the description. The description: It belongs to the anti tumor class of molecules.
user
C=C1C2CCC3(C(O)CC4C(C)(CC)CCCC4(COC(=O)N4CCOCC4)C3C2)C1O
assistant