You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
(4R,5R)-4-[8-(2-chloro-6-methoxypyridine-4-carbonyl)-2,8-diazaspiro[4.5]decane-2-carbonyl]-1-methyl-5-pyridin-3-ylpyrrolidin-2-one is the IUPAC name of a molecule. Please give its molecular formula.
user
C26H30ClN5O4
assistant