You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
What is the molecular formula of the compound with this IUPAC name 2-(2-bromophenoxy)-N-[2-[2-(furan-2-ylmethylamino)-2-oxoethyl]sulfanyl-4-oxothieno[3,2-d]pyrimidin-3-yl]acetamide ?
user
C21H17BrN4O5S2
assistant