You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
(5-phenyl-1,3,4-oxadiazol-2-yl)methyl 5,6,7,8-tetrahydro-4H-cyclohepta[b]thiophene-2-carboxylate The above is the IUPAC name of a molecule. Write its molecular formula.
user
C19H18N2O3S
assistant