You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
2-[[[4-(2,3-dimethylphenyl)piperazin-1-yl]-(ethylamino)methylidene]amino]-N-(4-hydroxyphenyl)acetamide is the IUPAC name of a molecule. Please give its molecular formula.
user
C23H31N5O2
assistant