You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
For the molecule named 3-butyl-4-[(E,3Z)-3-(3-butyl-5-oxo-1,2-oxazol-4-ylidene)prop-1-enyl]-1,2-oxazol-5-olate by IUPAC nomenclature, provide its molecular formula.
user
C17H21N2O4-
assistant