You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
For the molecule named (E,5S)-N-benzyl-N-(2-hydroxyethyl)-5-[(3R)-3-hydroxy-5-methoxy-1-methyl-2-oxoindol-3-yl]hex-3-enamide by IUPAC nomenclature, provide its molecular formula.
user
C25H30N2O5
assistant