1 19L (2s)-2-[[(2s)-2-[(2-azanyl-4-oxidanylidene-1h-pteridin-7-yl)carbonylamino]-3-oxidanyl-propanoyl]amino]-3-(1h-indol-3-yl)propanoic acid 1.000 2 RS8 N-[(2-amino-4-oxo-1,4-dihydropteridin-7-yl)carbonyl]glycyl-L-phenylalanine 0.806