You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
What is the molecular formula of the molecule (3R,4R)-4-acetyloxy-3-[(4-tert-butylphenyl)-(2-chloroethyl)carbamoyl]-5-(4-cyanoanilino)-5-oxopentanoic acid ?
user
C27H30ClN3O6
assistant