You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
3,5-dimethyl-1,2,3,3a,4,4a,5,6,7,7a,8,8a-dodecahydropyrazolo[4,3-f]indazole is the IUPAC name of a molecule. Please give its molecular formula.
user
C10H20N4
assistant