You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
(2S)-2-[[(2S)-2,3-dimethylbutanoyl]amino]-N-[(4S,5S,7R)-8-[[(2S)-1-(ethylamino)-1-oxopropan-2-yl]amino]-5-hydroxy-2,7-dimethyl-8-oxooctan-4-yl]butanediamide is the IUPAC name of a molecule. Please give its molecular formula.
user
C25H47N5O6
assistant