You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
(3R)-2-(3H-1,3-benzothiazol-2-ylidene)-3-(2,4-dichlorophenyl)-1-imino-3H-pyrido[2,1-b][1,3]benzothiazole-4-carbonitrile is the IUPAC name of a molecule. Please give its molecular formula.
user
C25H14Cl2N4S2
assistant