You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
[(1R,2S,7S,9S,10S,11S,12R)-2-(acetyloxymethyl)-10-hydroxy-1,5-dimethylspiro[8-oxatricyclo[7.2.1.02,7]dodec-5-ene-12,2'-oxirane]-11-yl] 2-chloroacetate is the IUPAC name of a molecule. Please give its molecular formula.
user
C19H25ClO7
assistant