You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Please write the molecular formula of the molecule (15S,19R)-1-(hydroxymethyl)-17-(4-methylphenyl)-17-azapentacyclo[6.6.5.02,7.09,14.015,19]nonadeca-2,4,6,9,11,13-hexaene-16,18-dione .
user
C26H21NO3
assistant