Catsyn offer gram to tons of 9H-3,9'-bicarbazole-1,1',2,2',3',4,4',5,5',6,6',7,7',8,8'-d15 | CAS 2778147-33-2, its formula is C24H16N2, molecular weight is 347.49g/mol and the purity is usually NLT 98%.