You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Provide the molecular formula for the IUPAC named substance N-[4-[2-[(2-tert-butyl-1,3-benzoxazol-5-yl)amino]-2-oxoethyl]-1,3-thiazol-2-yl]thiophene-2-carboxamide .
user
C21H20N4O3S2
assistant