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 (4-oxopyrimido[2,1-b][1,3]benzothiazol-2-yl)methyl 2-(1,3-benzoxazol-2-ylsulfanyl)acetate .
user
C20H13N3O4S2
assistant