You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
[(1S,2R,7R,9R,11R,12S)-1,2,5-trimethyl-4-oxospiro[8-oxatricyclo[7.2.1.02,7]dodec-5-ene-12,2'-oxirane]-11-yl] (E)-but-2-enoate is the IUPAC name of a molecule. Please give its molecular formula.
user
C19H24O5
assistant