You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Name the molecular formula for the molecule established as (4-oxo-6,7,8,9-tetrahydropyrimido[2,1-b][1,3]benzothiazol-2-yl)methyl 2-(4-cyanophenoxy)acetate using the IUPAC nomenclature.
user
C20H17N3O4S
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