You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
7-[(6-bromo-1,3-benzodioxol-5-yl)methyl]-3-methyl-6,8-dihydro-5H-[1,2,4]triazolo[4,3-a]pyrazine-6-carboxylic acid is the IUPAC name of a molecule. Please give its molecular formula.
user
C15H15BrN4O4
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