You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
For the molecule named N-(12,14-dimethoxy-5-methyl-3-thiatricyclo[8.4.0.02,6]tetradeca-1(10),2(6),4,11,13-pentaen-4-yl)acetamide;formaldehyde;methanamine by IUPAC nomenclature, provide its molecular formula.
user
C20H28N2O4S
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