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: The molecule is estrogen receptor modulator.
user
C#CC1(O)CCC2C3CC=C4CC(O)CCC4(CC)C3CCC21C
assistant