N-[(5-{2-[(6R)-2-amino-4-oxo-3,4,5,6,7,8-hexahydropyrido[2,3-d]pyrimidin-6-yl]ethyl}thiophen-2-yl)carbonyl]-L-glutamic acid
n-[(5-{2-[(6r)-2-amino-4-oxo-3,4,5,6,7,8-hexahydropyrido[2,3-d]pyrimidin-6-yl]ethyl}thiophen-2-yl)carbonyl]-l-glutamic acid