Looking for a carcinogen for experiment!

[richardhk at HOTMAIL.COM]

Does anyone know where can I purchase a
carcinogen--N-butyl-N-(4-hydroxybutyl)-nitrosamine for my experiment?

If anyone really knows, pls let me know by telling me the name of
supplier(s) which would offer this carcinogen, because I have found that
this carcinogen is unavailable in Merck and Sigma.

Thanks a lot!

Richard Li
Dept. of Biochemistry,
CUHK
Email: Richardhk at hotmail.com