CAS 89957-38-0 appears in our catalog under these names: CYTOCHROME P450 CYP1A2, RBXHU-100UL, CYTOCHROME P450 CYP3A1, RB X-100UL, CYTOCHROME P450 CYP3A4, RB X-100UL, CYTOCHROM P450 CYP1A1&1A2,RBX-100UL, CYTOCHROME P450 CYP1A1, RB X-100UL. Offered by: Sigma-Aldrich. Available pack sizes: 1EA, 1ML.