N-(1H-indol-5-ylmethyl)-2-[6-methyl-2-oxo-3-(2-phenylethylamino)pyrazin-1-yl]acetamide
N-(1H-indol-5-ylmethyl)-2-[6-methyl-2-oxo-3-(2-phenylethylamino)-1-pyrazinyl]acetamide
N-(1H-indol-5-ylmethyl)-2-[2-keto-6-methyl-3-(2-phenylethylamino)pyrazin-1-yl]acetamide
N-(1H-indol-5-ylmethyl)-2-[6-methyl-2-oxo-3-(2-phenylethylamino)pyrazin-1-yl]ethanamide