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 identified by 5-methyl-4-[(3-methyl-5-oxo-1,2-dihydropyrazol-4-yl)-naphthalen-1-ylmethyl]-1,2-dihydropyrazol-3-one ?
user
C19H18N4O2
assistant