You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Translate the chemical IUPAC name 1-(1,5-dimethyl-3-oxo-2-phenylpyrazol-4-yl)-3-[(Z)-(2-hydroxy-5-nitrophenyl)methylideneamino]thiourea into its molecular formula.
user
C19H18N6O4S
assistant