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 2-[[(2S)-1-[carboxymethyl(2,3-dihydro-1,4-benzodioxin-6-yl)amino]-4-methyl-1-oxopentan-2-yl]amino]pentanedioic acid ?
user
C21H28N2O9
assistant