You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Provide the molecular formula for the IUPAC named substance 3-(1-tert-butyl-6-methyl-4-oxopyrazolo[3,4-d]pyrimidin-5-yl)-N-(2-ethoxyphenyl)propanamide .
user
C21H27N5O3
assistant