Difenzoquat methylsulfate Back Catalog number: 70649 Manufacturer: ABSOLUTE STANDARDS Availability: In the manufacturer's stock Price on request - + Recommended 14076.9-K-ME Homovanillic acid-d5, 1000µg/ml in MeOH, 1ml Price on request 98595 Acetonitrile Price on request 30033 EPA Method 525 - Tuning Standard Price on request