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-[5-(4-cyclopentylpiperazin-1-yl)sulfonyl-2-ethoxyphenyl]-1-methyl-3-propyl-6H-pyrazolo[4,3-d]pyrimidin-7-one .
user
C26H36N6O4S
assistant