You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
[(2S)-1-[[(1S)-1-carboxy-2-phenylethyl]-(2H-pyrazin-1-yl)amino]-3-methyl-1-oxobutan-2-yl]imino-oxido-(phenylmethoxycarbonylaminomethyl)phosphanium is the IUPAC name of a molecule. Please give its molecular formula.
user
C27H32N5O6P
assistant