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 N'-[2-(2,3-dihydro-1,4-benzodioxin-6-ylsulfanyl)acetyl]-2-(5,6-dimethyl-4-oxo-3H-thieno[2,3-d]pyrimidin-2-yl)acetohydrazide ?
user
C20H20N4O5S2
assistant