You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Can you give the molecular formula of the molecule 2-[(3,5-dimethyl-1H-pyrazol-4-yl)sulfonyl]-3,4,10,10a-tetrahydro-1H-pyrazino[1,2-a]indole ?
user
C16H20N4O2S
assistant