You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
(3aS,5E,6aR)-1-(2-hydroxyethyl)-6-methylidene-5-[(Z)-1-[5-(5,6,7,8-tetrahydroimidazo[1,2-a]pyridin-2-yl)-1,2,4-oxadiazol-3-yl]but-2-enylidene]-3,3a,4,6a-tetrahydrocyclopenta[b]pyrrol-2-one is the IUPAC name of a molecule. Please give its molecular formula.
user
C23H27N5O3
assistant