You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
1-[(5-tert-butyl-1,3-oxazol-2-yl)methyl]-2-methyl-3-[(2-pyrrolidin-1-ylpyridin-4-yl)methyl]guanidine is the IUPAC name of a molecule. Please give its molecular formula.
user
C20H30N6O
assistant