Test-E Drug Classifications

Does anyone know the difference between these?

6-keto Testosterone Enanthate
Molecular Formula C26H40O4
Formula Weight 416.6
Formulation A solution in methyl acetate
Purity >98%
λmax 240 nm
6-keto Testosterone enanthate is a synthetic analog of testosterone enanthate.

Size Price
1 mg $138.00
5 mg $621.00
10 mg $1,104.00
50 mg $4,830.00

6β-testosterone enanthate
Molecular Formula C26H40O4
Formula Weight 416.6
Formulation A solution in methyl acetate
Purity >98%
λmax 236 nm

6α-Testosterone Enanthate
Molecular Formula C26H40O4
Formula Weight 416.6
Formulation A solution in methyl acetate
Purity >98%
λmax 240 nm
Stability 1 year