You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
ethyl (6S,7R)-2-methyl-5-oxo-7-phenyl-6,7-dihydro-4H-[1,2,4]triazolo[1,5-a]pyrimidine-6-carboxylate The above is the IUPAC name of a molecule. Write its molecular formula.
user
C15H16N4O3
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