Table 3. Non-teratogenic thalidomide analogues; positional isomers; alteration from α- to β-configuration.

Name	Systematic name	Structure	Test species and references
β-Thalidomide (β-phthalimidoglutarimide) [23]	2-(2,6-Dioxopiperidin-4-yl)-1H-isoindole-1,3(2H)-dione		Rabbit46
β-EM12 (β-phthalimido-piperidindione) [24]	4-(1-Oxo-1,3-dihydro-2H-isoindol-2-yl)piperidine-2,6-dione		Rabbit46