You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Can you give the molecular formula of the molecule N-methyl-N-[(5-phenyl-1,2-oxazol-2-ium-3-yl)methyl]-5-(2,2,2-trifluoroacetyl)thiophene-2-carboxamide ?
user
C18H14F3N2O3S+
assistant