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 2-[(3R,5aR,9aS)-5-oxo-2,3,5a,6,7,8,9,9a-octahydro-[1,3]thiazolo[2,3-b]quinazolin-3-yl]-N-[[5-(furan-2-yl)-1,2-oxazol-3-yl]methyl]acetamide .
user
C20H22N4O4S
assistant