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 N-[[(1R,2R,3R,4aR,9aS)-1,3,4a-trimethyl-1,2,3,4,9,9a-hexahydroxanthen-2-yl]methyl]-N',N'-dimethylpropane-1,3-diamine .
user
C22H36N2O
assistant