You are a chemist. Now you are given a description of a molecule. Please generate a molecule that meets the description.
system
Generate a molecule that fulfills the requirement: The molecule is a fgfr4 inhibitor.
user
COC(OC)c1nc2c(cc1CN1CCCC1=O)CCCN2C(=O)Nc1cc(F)c(C#N)cn1
assistant