(S)-N-5-[2-(2-amino-4-oxo-4,6,7,8-tetrahydro-1H-pyrimido[5,4-b][1,4]thiazin-6-yl)ethyl-2-thenoyl]-L-glutamsyre
(S)-N-5-[2-(2-amino-4-oxo-4,6,7,8-tetrahydro-1H-pyrimido[5,4-b][1,4]thiazin-6-yl)ethyl-2-thenoyl]-L-glutamic acid