Acidum foscolicum

2-[(1,2-dihydroxy-1-oxopropan-2-yl)-hydroxyphosphoryl]-2-hydroxypropanoic acid

2-[(1,2-dihydroxy-1-oxo-propan-2-yl)-hydroxy-phosphoryl]-2-hydroxy-propanoic acid

2-[(1,2-dihydroxy-2-keto-1-methyl-ethyl)-hydroxy-phosphoryl]-2-hydroxy-propionic acid