Ethynylestradiol (20,21-13C2,99%) 100 µg/mL in Acetonitrile, 1,2ml Back Catalog number: CLM-3375-1.2 Availability: In the manufacturer's stock Price on request - + Recommended 95489 EPA Method 524.3 - Surrogate Standard Price on request 3422.11-100-AN Imidan Price on request 79253 2-Butanone Price on request