You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
(1S,3S,9S,10R)-15-(4-chlorophenyl)-12-(5-hydroxypentyl)-3,7-dimethyl-2-oxa-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
C27H32ClN3O5
assistant