You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
What is the molecular formula of the molecule (1R,2S,5S,10R,11S,12R,15R,19S)-11-hydroxy-1,5,10,15-tetramethyl-6-(oxolan-3-yl)-13-oxapentacyclo[10.6.1.02,10.05,9.015,19]nonadec-8-en-18-one ?
user
C26H38O4
assistant