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 methyl (7R)-5-amino-6-cyano-7-(2,5-dimethoxyphenyl)-2-methyl-7H-thieno[3,2-b]pyran-3-carboxylate .
user
C19H18N2O5S
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