You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
What is the molecular formula of the compound with this IUPAC name 1-[(1R,3aR,7aR)-1-(diethylaminomethyl)-3,3a,4,6,7,7a-hexahydro-1H-furo[3,4-c]pyridin-5-yl]-3-phenylpropan-1-one ?
user
C21H32N2O2
assistant