3,3'-bis{[5''-tert-butylsulfanyl-2''-(4'''-ethynyl-2'''-nitrophenyl)ethynylphenyl]ethynyl}tolane

3,3'-bis{[5''-tert-butylsulfanyl-2''-(2'''-nitro-4'''-triisopropylsilylethynylphenyl)ethynyl]phenylethynyl}tolane