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 2-(6-ethyl-4-oxothieno[2,3-d]pyrimidin-3-yl)-N-(8-methyl-2,4-dioxo-1,3-diazaspiro[4.5]decan-3-yl)acetamide .
user
C19H23N5O4S
assistant