You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
pentyl (7R)-7-(2-methoxyphenyl)-5-methyl-4,7-dihydro-[1,2,4]triazolo[1,5-a]pyrimidine-6-carboxylate The above is the IUPAC name of a molecule. Write its molecular formula.
user
C19H24N4O3
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