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 (1S,2R,4S,7E,11S,12S)-12-ethyl-4,8-dimethyl-14-oxatricyclo[9.3.0.02,4]tetradec-7-en-13-one .
user
C17H26O2
assistant