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 (2R,6R,12R,16R,18S)-4,4,12,16,18-pentamethyl-3,5-dioxapentacyclo[11.7.0.02,6.07,12.016,20]icosan-18-ol ?
user
C23H38O3
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