Looking for a carcinogen for my experiment!!

[b577724 at MAILSERV.CUHK.EDU.HK]

Does anyone know where can I purchase the carcinogen--
N-butyl-N-(4-hydroxybutyl)nitrosamine (BBN) for the induction of urinary
bladder cancer in rat? I have found that this carcinogen is not unavailable
in Merck and Sigma! If anyone knows, pls let me know! 

Richard Li
Dept. of Biochemistry
CUHK

Email: richardhk at hotmail.com