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-[2-[4-(2,5-dimethylphenyl)piperazin-1-yl]-2-oxoethyl]-4-(pyridin-3-ylmethyl)phthalazin-1-one ?
user
C28H29N5O2
assistant