2s 2 hydroxypropanal, s lactaldehyde, l 2 hydroxypropionaldehyde

s 2 amino 3 butynoic acid, s 2 amino 4 pentynoic acid, l c propargylglycine

s 2 amino 3 methyl 1 butanol, s 2 amino 3 methylbutanol, 2 amino 3 methyl 1 butanol

r 2 amino 3 phenylpropanol, s 2 amino 3 phenyl 1 propanol, s 2 benzylethanolamine