You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
5-[(2-methyl-4-oxopyrazolo[1,5-a]pyrazin-5-yl)methyl]-1,2-oxazole-3-carboxylic acid is the IUPAC name of a molecule. Please give its molecular formula.
user
C12H10N4O4
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