You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
What is the molecular formula of the compound with this IUPAC name (5-ethyl-1,2-oxazol-3-yl)-[(3R)-3-(2-methoxyphenyl)-4-methylpiperazin-1-yl]methanone ?
user
C18H23N3O3
assistant