You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
N-[(1R)-2-[(3R)-3-hydroxypyrrolidin-1-yl]-1-phenylethyl]-N-methyl-2,2-diphenylacetamide is the IUPAC name of a molecule. Please give its molecular formula.
user
C27H30N2O2
assistant