You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
What is the molecular formula of the molecule N-[(1R,2S,3R)-2-hydroxy-3-(3-oxopiperazin-1-yl)cyclohexyl]-N,2-dimethyl-3H-benzimidazole-5-carboxamide ?
user
C20H27N5O3
assistant