WS Disinfection By-Products - Cal Check Back Catalog number: 91837 Manufacturer: ABSOLUTE STANDARDS Availability: In the manufacturer's stock Price on request - + Recommended 0643.28-100-IO alphaßß (20R,24S)-24-Methylcholestane, 100µg/mL, Solvent-isooctane, Unit 1mL, # of units-1, Cas.no. 71117-90-3 Price on request 11755.12-100-IO 2,2',3,3',4,4',6-Heptachlorobiphenyl ,100 µg/mL,isooctane,1mL, Price on request 70914 Hydroquinone Price on request