13C3-Caffeine, 100 µg/ml, Methanol, 1ml Back Catalog number: 681491 Manufacturer: HPC STANDARDS GmbH Availability: In the manufacturer's stock Price on request - + Recommended 1024.18-100-T Chrysene-d12, 100µg/mL in Toluene, 1ml Price on request 71045 2,6-Dimethylpyrazine Price on request 11191.22-10MG Sildenafil-d8 (piperazine-d8),neat,neat,10mg Price on request