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 identified by 3-[3-methylidene-1-oxo-4-[[1-(1,3-thiazol-2-yl)ethenylamino]methyl]isoindol-2-yl]piperidine-2,6-dione ?
user
C20H18N4O3S
assistant