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=Cc1cn(C2OC(C)C(O)C2O)c(=O)nc1NC(=O)OCC1CC1
assistant