You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
(4aR,6aR,6aS,6bR,8aR,12aS,14bS)-4,4,6a,6b,14b-pentamethyl-8a-[(E)-2-(1-methylpyrrolidin-2-yl)ethenyl]-3,13-dioxospiro[4a,5,6,6a,7,8,9,10,12,12a-decahydropicene-11,1'-cyclopropane]-2-carbonitrile is the IUPAC name of a molecule. Please give its molecular formula.
user
C37H50N2O2
assistant