You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
(2R,3R,8R)-N-[1-(2-hydroxyethyl)piperidin-4-yl]-2'-oxospiro[1,2,5,6,7,8-hexahydropyrrolizine-3,3'-1H-indole]-2-carboxamide is the IUPAC name of a molecule. Please give its molecular formula.
user
C22H30N4O3
assistant