The 2:3 condensation product, C19H22N2O2, formed by reaction of (S)-()-2-amino-1-phenylethanol with formaldehyde has an N,N'-methylenebis(o
xazolidine) heterocyclic skeleton. The two oxazolidine rings have enve
lope-type conformations, with their N atoms displaced by 0.604(5) and
0.537(6) Angstrom from the mean planes formed by the remaining four at
oms of each ring. The dihedral angle between the two planes is 110.2(2
)degrees.