You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
(1S,3S,9R,10S)-15-butyl-7-(4-ethoxyphenyl)-12-(2-hydroxyethyl)-2-thia-7,12,15-triazatetracyclo[8.8.0.01,13.03,9]octadeca-4,17-diene-8,11,14-trione is the IUPAC name of a molecule. Please give its molecular formula.
user