You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Please write the molecular formula of the molecule 5-(2-ethyl-4-methyl-1,3-dioxetan-2-yl)-3-(4-phenylsulfanylphenyl)-1H-pyrazolo[1,5-a]pyrimidin-7-one .
user
C23H21N3O3S
assistant