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 (1R,12S,15S)-1-hydroxy-7-methoxy-10-(3-methylbut-2-enyl)-12-(2-methylprop-1-enyl)-10,13,19-triazapentacyclo[11.7.0.03,11.04,9.015,19]icosa-3(11),4(9),5,7-tetraene-2,14,20-trione .
user
C27H31N3O5
assistant