You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Please write the SMILES representation of the molecule (2E)-3-butyl-2-[(2E,4E)-5-(3-butyl-1,1-dimethyl-3a,4,5,9b-tetrahydrobenzo[e]indol-3-ium-2-yl)penta-2,4-dienylidene]-1,1-dimethyl-3a,4,5,9b-tetrahydrobenzo[e]indole .
user
CCCCN1C(=CC=CC=CC2=[N+](CCCC)C3CCC4=CC=CC=C4C3C2(C)C)C(C)(C)C2C3=CC=CC=C3CCC21
assistant