You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Translate the chemical IUPAC name (15S,19S)-1-[(1R)-1-hydroxyethyl]-17-(4-methoxyphenyl)-17-azapentacyclo[6.6.5.02,7.09,14.015,19]nonadeca-2,4,6,9,11,13-hexaene-16,18-dione into its molecular formula.
user
C27H23NO4
assistant