CAS 22843-73-8 appears in our catalog under these names: 5,10,15,20–Tetrakis(4–nitrophenyl)porphyrin, FLN43738 98%, 5,10,15,20-Tetrakis(4-nitrophenyl)porphyrin, 98%, 98%, 5,10,15,20-Tetrakis(4-nitrophenyl)porphyrin, 98%. Offered by: GLPBio, Ambeed, Chemat, Fluorochem. Available pack sizes: 100mg, 1g, 250mg, 25mg, 50mg, 5g.