You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Please write the molecular formula of the molecule 8-methyl-2-(7H-pyrrolo[2,3-d]pyrimidin-4-yl)-3,4,6,7,9,9a-hexahydro-1H-pyrazino[1,2-a]pyrazine .
user
C14H20N6
assistant