Custom Calibration Standard Back Catalog number: 50254 Manufacturer: ABSOLUTE STANDARDS Availability: In the manufacturer's stock Price on request - + Recommended 681204 (-)-Hyoscyamine, 100mg Price on request 81504 2,4,5-TP methyl ester Price on request 673816 Fenbutatin oxide, 10 µg/ml, Cyclohexane, 10ml Price on request