You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
(9E)-20-(2,3-dihydroxypropyl)-2,2,4,4-tetramethyl-7-oxa-3,20-diazadispiro[5.1.118.26]henicos-9-en-21-one is the IUPAC name of a molecule. Please give its molecular formula.
user
C25H44N2O4
assistant