You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
6-amino-5-[(6R)-3-hydroxy-2,6-dimethylcyclohexa-1,3-dien-1-yl]-3-methylpyrrolo[2,3-b]pyrazine-7-carboxamide is the IUPAC name of a molecule. Please give its molecular formula.
user
C16H19N5O2
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