Composition: Chlorobenzene D5 2000µg/ml [3114-55-4]1,4-Dichlorobenzene D4 2000µg/ml [3855-82-1]1,4-Difluorobenzene 2000µg/ml [540-36-3]Pentafluorobenzene 2000µg/ml [363-72-4]