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 4-[2-(2,3-dihydro-1,3-benzothiazol-2-yl)ethenyl]-1-ethyl-5-hydroxy-3-phenylimidazole-2-thione .
user
C20H19N3OS2
assistant