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,5S)-2-[4-[(E)-hydroxyiminomethyl]-7a-methyl-1-methylidene-3,3a,4,5,6,7-hexahydro-2H-inden-5-yl]-2-methyl-6-oxabicyclo[3.2.1]octan-7-one .
user
C20H29NO3
assistant