You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
(3aR)-6-(3,7-dimethyloctyl)-4,8-bis(4-methylthiophen-2-yl)-3,3a-dihydropyrrolo[3,4-f][2,1,3]benzothiadiazole-5,7-dione is the IUPAC name of a molecule. Please give its molecular formula.
user
C28H33N3O2S3
assistant