You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Please write the molecular formula of the molecule 4-hydroxy-2-[3-nitro-4-(4-propan-2-ylphenoxy)phenyl]-3aH-[1,3]thiazolo[5,4-d]pyrimidine .
user
C20H18N4O4S
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