You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
[3-(3-methyl-3,4,6,7,8,8a-hexahydro-1H-pyrrolo[1,2-a]pyrazin-2-yl)-5-nitrophenyl]hydrazine The above is the IUPAC name of a molecule. Write its molecular formula.
user
C14H21N5O2
assistant