You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
What is the molecular formula of the molecule 2-(2,4-dioxo-8-oxa-1,3-diazaspiro[4.5]decan-3-yl)-N-(2-thiophen-2-ylethyl)acetamide ?
user
C15H19N3O4S
assistant