You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
(2S,3S)-2-[[(E)-9-hydroxy-15,17-dimethyl-10-oxooctadec-12-enoyl]amino]-3-methylpentanoic acid is the IUPAC name of a molecule. Please give its molecular formula.
user
C26H47NO5
assistant