You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
For the molecule named (3S,4S)-4-[2-[[7-[[ethyl-oxo-(triiodomethyl)-lambda6-sulfanylidene]amino]-5-iodo-6-methylquinazolin-4-yl]amino]-5-fluorophenoxy]oxolan-3-ol by IUPAC nomenclature, provide its molecular formula.
user
C22H21FI4N4O4S
assistant