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]