15 N 13 C ISOTEC ® Stable Isotopes Labeled Bioactive Compounds Cat. No. Product Description Isotopic Purity 706035 Aldosterone-2,2,4,6,6,17-d 6 (variable deuteration on C21) 98 atom % D 708984 Ammelide- 13 C 3 99 atom % 13 C 709263 Ammeline- 13 C 3 99 atom % 13 C 699411 7-Azaindole-1- 15 N 98 atom % 15 N 699330 7-Azaindole- 15 N 1 (pyridine- 15 N) 98 atom % 15 N 691763 Azelaic acid - 13 C 9 99 atom % 13 C 705101 Barbituric acid - 13 C 4 , 15 N 3 99 atom % 13 C 98 atom % 15 N 705268 Biotin-d 2 (ring-6,6-d 2 ) 98 atom % D 706337 Caffeic acid- 13 C 9 99 atom % 13 C 588598 Caffeine-3-methyl- 13 C 99 atom % 13 C 485365 Caffeine-trimethyl- 13 C 3 99 atom % 13 C 614122 Chenodeoxycholic acid-2,2,4,4-d 4 98 atom % D 696935 Chlorpromazine-d 6 (dimethyl-d 6 ) 98 atom % D 701726 Chlorzoxazone-2- 13 C, 18 O (hydroxy- 18 O) 99 atom % 13 C 95 atom % 18 O 707678 Cholesterol-25,26,27- 13 C 3 99 atom % 13 C 488577 Cholesterol-2,2,3,4,4,6-d 6 97 atom % D 677574 Cholesterol-25,26,26,26,27,27,27-d 7 99 atom % D 679046 Cholesterol-26,26,26,27,27,27-d 6 98 atom % D 488585 Cholesterol-3,4- 13 C 2 99 atom % 13 C 605875 Cholesterol-4- 13 C 99 atom % 13 C 614149 Cholic acid-2,2,4,4-d 4 98 atom % D 614106 Cholic acid-2,2,3,4,4-d 5 98 atom % D Cat. No. Product Description Isotopic Purity 605883 Cholic acid-24- 13 C 99 atom % 13 C 696927 Clenbuterol-d 9 (t-butyl-d 9 ) 98 atom % D 705586 Cortisone-2,2,4,6,6,12,12-d 7 98 atom % D 687820 Cyanuric acid- 13 C 3 99 atom % 13 C 685119 Deoxycholic acid -24- 13 C 99 atom % 13 C 614130 Deoxycholic acid-2,2,4,4-d 4 98 atom % D 710784 11-Deoxycortisol-2,2,4,6,6 -d 5 98 atom % D 705942 1a,25-Dihydroxyvitamin D3 (6,19,19-d 3 ) 97 atom % D 705640 1,7-Dimethyluric acid- 13 C 4 , 15 N 3 99 atom % 13 C 98 atom % 15 N 705373 1,7-Dimethylxanthine-d 6 (dimethyl-d 6 ) 98 atom % D 705357 3,7-Dimethylxanthine-d 6 (dimethyl-d 6 ) 98 atom % D 491187 17b-Estradiol-16,16,17-d 3 98 atom % D 613967 17b-Estradiol-2,4,16,16,17-d 5 97 atom % D 489204 Estrone-2,4,16,16-d 4 95 atom % D 524956 Estrone-2,4,16,16-d 4 3-sulfate, sodium salt 95 atom % D 710792 18-Hydroxycorticosterone- 9,11,12,12 -d 4 98 atom % D 614157 Hydrocortisone-1a,2a-d 2 98 atom % D 705594 Hydrocortisone-9,11,12,12-d 4 98 atom % D 705497 25-Hydroxyvitamin D2 (6,19,19-d 3 ) 97 atom % D 705888 25-Hydroxyvitamin D3 (6,19,19-d 3 ) 97 atom % D 709557 3-Iodothyronamine-d 4 (ethylamino-1,1,2,2- d 4 ) hydrochloride 98 atom % D 589292 Lithocholic acid-11,12-d 2 97 atom % D 614033 Lithocholic acid-2,2,3,4,4-d 5 98 atom % D Whether you are developing analytical methods or performing routine testing, our 13 C, 15 N and deuterium labeled bioactive compounds are reliable internal standards for your most demanding applications. Our products have the highest isotopic enrichments available for precise and accurate quantitation. We offer a wide range of compounds including steroids, hormones, vitamins and various metabolites. In addition, we now provide 13 C and 15 N labeled melamine and related products. These materials can facilitate research and method development and are reliable standards for mass spectrometric detection of these potential impurities. For a full listing of these products, visit sigma-aldrich.com/sibio