1-Methyl-3-nitroso-5H-pyrido(4,3-b)indole 3-Nitroso-1-methyl-5H-pyrido(4,3-b)indole 5H-Pyrido(4,3-b)indole, 1-methyl-3-nitroso- 74317-46-7 Trp-P-2 nitroso derivative