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 ethyl 4-[4-[6-[(4-methylsulfonylpiperazin-1-yl)methyl]-4-morpholin-4-ylthieno[3,2-d]pyrimidin-2-yl]phenoxy]butanoate .
user
C28H37N5O6S2
assistant