EPA Method 515.1 Internal Standard Back Catalog number: 30023 Manufacturer: ABSOLUTE STANDARDS Availability: In the manufacturer's stock Price on request - + Recommended 91703 EPA Method 502.2 Internal Standard Price on request M373553 Mitragynine-d3, 1mg Price on request C2370-5G Citalopram Hydrobromide, >98%, 5g Price on request