EPA Method 507/525 Analytes Mix #4 Back Catalog number: 30085 Manufacturer: ABSOLUTE STANDARDS Availability: In the manufacturer's stock Price on request - + Recommended 72242 n-Propyl gallate (PG) Price on request 12035.19-100-AN 4-ANPP,100 µg/mL,acetonitrile,1mL, Price on request 677784 Metformin hydrochloride, 100 µg/ml, Methanol, 1m Price on request