What is the molecular formula of the molecule benzyl N-[(2S)-1-[[(2S)-1-[[(2S)-1-(benzylamino)-4-methyl-1-oxopentan-2-yl]amino]-3-hydroxy-1-oxopropan-2-yl]amino]-1-oxo-3-pyrrolidin-2-ylpropan-2-yl]carbamate ?