You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
N-[4-[but-1-en-2-yl-[3-[(2,3-dihydroxybenzoyl)amino]propyl]amino]butyl]-2,3-dihydroxybenzamide is the IUPAC name of a molecule. Please give its molecular formula.
user
C25H33N3O6
assistant