You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
What is the molecular formula of the molecule 7-[[2-(5-chloro-1-sulfanylpyrrolo[2,3-b]pyridin-3-yl)-5-fluoropyrimidin-4-yl]amino]-3-methyl-1-oxa-3-azaspiro[4.5]decan-2-one ?
user
C20H20ClFN6O2S
assistant