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 2-[(1R,3aS,4S,5S,7aR)-5-[(2R,5S)-5-(cyanomethyl)-2-methyloxolan-2-yl]-7a-methyl-1-(6-methylheptan-2-yl)-1,2,3,3a,4,5,6,7-octahydroinden-4-yl]acetic acid .
user
C27H45NO3
assistant