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-(5-methyl-1,2-oxazol-3-yl)-2-[4-(2-methyl-4-phenyl-1,3-thiazole-5-carbonyl)piperazin-1-yl]acetamide .
user
C21H23N5O3S
assistant