4-(2-(2-amino-4-oxo-4,6,7,8-tetrahydro-3H-pyrimidino(5,4-6)(1,4)thiazin-6-yl)-(S)-ethyl)-2,5-thienoyl-L-glutamic acid
4-(2-(2-amino-4-oxo-4,6,7,8-tetrahydro-3h-pyrimidino(5,4-6)(1,4)thiazin-6-yl)-(s)-ethyl)-2,5-thienoyl-l-glutamic acid