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 nmda antagonist class of molecules.
user
COc1ccc2c(c1)C1(CCCCc3ccccc31)N(C)C2
assistant