You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Can you give the molecular formula of the molecule 2-[1-(2,2-dimethylpropyl)-3-[(6-methoxy-1H-benzimidazol-2-yl)methyl]piperidin-4-yl]acetic acid ?
user
C21H31N3O3
assistant