a D-5-monosubstituted hydantoin <=> a L-5-monosubstituted hydantoin
a d-5-monosubstituted hydantoin <=> a l-5-monosubstituted hydantoin
a D-5-monosubstituted hydantoin <=> a L-5-monosubstituted hydantoin
a d-5-monosubstituted hydantoin <=> a l-5-monosubstituted hydantoin