You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Can you give the molecular formula of the molecule 2-(2,3-dihydro-[1,4]dioxino[2,3-b]pyridin-2-ylmethoxy)-9-sulfanyloxy-6,7-dihydropyrimido[6,1-a]isoquinolin-4-one ?
user
C20H17N3O5S
assistant