CAS 81201-92-5 appears in our catalog under these names: L–Tryptophan–1–13C, L-Tryptophan-1-13C, >95% (HPLC), L-Tryptophan-1-13C, L-Tryptophan-1-13C, 99.00%. Offered by: GLPBio, TRC, Biosynth, MedChemExpress. Available pack sizes: 5mg, 2,5mg, 25mg, 1mg, 10mg, 50mg, 10 mg, 25 mg.