(Z)-2,3-dichloro-2-butene, 2-Butene, 2,3-dichloro-, (Z)-, 2,3-dichloro-but-2c-ene, cis-dichloro-2 butene, 2,3-Dichlor-but-2c-en, (Z)-2,3-dichloro-but-2-ene, 2-Butene,2,3-dichloro-,(Z), 2-Butene,2,3-dichloro, cis-2,3-dichloro-2-butene, 2,3-dichloro-2-butene,cis form