Serotonin-d4 Hydrochloride, 2,5mg Back Catalog number: S274982 Manufacturer: TORONTO RESEARCH CHEMICALS Availability: In the manufacturer's stock Price on request - + Recommended 81203 EPA Method 8121 Internal Standard Price on request 50800 Spiking Solution #1 Price on request 72026 6-Propyl-2-thiouracil Price on request