You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Translate the chemical IUPAC name 5-[3-(2,4,5-trichlorophenoxy)propoxy]-9-oxa-1,3,5-triazaspiro[5.5]undeca-1,3-diene-2,4-diamine;hydrobromide into its molecular formula.
user
C16H21BrCl3N5O3
assistant