I have an old catalog from ICON Services Inc who supply labeled compounds.
Whether they have what you need I don't know, but may be able to point you
in the right direction.  Their address is:

ICON Services Inc.
19 Ox Bow Lane
Summit, NJ  07901
800-322-4266
fax 908-273-0449

cheers,
greg

Dr. Greg B. Arehart
Department of Geological Sciences
University of Nevada - Reno
Reno, NV  89557-0132  USA
ph: 702-784-6470
fax: 702-784-1833
email: [log in to unmask]