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 (7R,8aS)-7-(5-cyclopropylpyrazin-2-yl)oxy-2-(5-cyclopropylpyridin-3-yl)sulfonyl-3,4,6,7,8,8a-hexahydro-1H-pyrrolo[1,2-a]pyrazine .
user
C22H27N5O3S
assistant