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 5-[4-(5,6-diethyl-1,2,4-triazin-3-yl)piperazin-1-yl]-2-(furan-2-yl)-1,3-oxazole-4-carbonitrile .
user
C19H21N7O2
assistant