Methotrexate Back Catalog number: 72209 Manufacturer: ABSOLUTE STANDARDS Availability: In the manufacturer's stock Price on request - + Recommended 96899 EPA Method 8260 - Purgeable Internal Standard Price on request 0976.29-100-IOX5 d2 C29 alpha alpha alpha (20R)-Ethylcholestane, 100µg/mL, Solvent-isooctane, 100µg/mL in Isooctane, 5 x 1ml Price on request 2231.20-10-5AN Ochratoxin A, 10 µg/mL, Solvent-acetonitrile, Unit 5mL, # of units-1, Cas.no. 303-47-9 Price on request