You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Name the molecular formula for the molecule established as N-[(2S)-butan-2-yl]-2-[6-(2-methylpropyl)-5,7-dioxo-[1,2]thiazolo[4,3-d]pyrimidin-4-yl]acetamide using the IUPAC nomenclature.
user
C15H22N4O3S
assistant