4,9,10-Trimethyl-1,2-benzanthracene ,its CAS number is 20627-33-2,it can be called Benz(a)anthracene, 6,7,12-trimethyl- ; 6,7,12-Trimethylbenz(a)anthracene and 4,9,10-Trimethyl-1,2-benzanthracene .