United States Pharmacopeia (USP) Reference Standard Synonym(s): 9-Methyl-1,2,3,9-tetrahydro-4 H -carbazol-4-one; 1,2,3,9-Tetrahydro-9-methyl-4 H -carbazol-4-one Empirical Formula: C13H13NO Formula Weight: 199.25 Linear Formula: C13H13NO MDL Number:...