(HO) 2P (O){CH2)~ CH (NH2) COOH(I) represent a new and promising class of antispasmodic compounds, which have been studied extensively in recent years [I, 3-8]. 2- Amino-5-phosphonovaleric acid (I, n= 3) and 2-amino-7-phosphonoheptanoic (I, n= 5) acids exhibit the highest antispasmodic activity [I, 5-7] and are strong selective antagonists of N- methyl-D-aspartic (NMDA) receptors, which probably also determines their antispasmodic ...