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 1-(5-ethyl-3-methyl-1,2-oxazol-4-yl)-3-[1-(5-methyl-1,3-thiazol-2-yl)ethyl]urea ?
user
C13H18N4O2S
assistant