ISTD/Surrogate Standard Back Catalog number: 92572 Manufacturer: ABSOLUTE STANDARDS Availability: In the manufacturer's stock Price on request - + Recommended 678215 D4-Propyl paraben, 100 µg/ml, Methanol, 1ml Price on request M-625-03-10X Benz(a)anthracene-d12, 2.0mg/mL in CH2Cl2. 1mL Price on request CFN99171 Astragaloside IV, >98%, 20mg Price on request