Superdol is NOT methylated Masteron. This is simply not true.
Superdrol is a super-saturated, or 2-reduced, form of Anadrol. Anadrol has a =C-OH at the 2nd position, and if this is totally saturated (reduced) with hydrogen, it gives -CH3. Another way to describe it is that it is a 2a-17a-dimethyl of drostanolone (Masteron). Masteron has a single methyl group at the 2nd position. Superdrol is a modification of this structure by adding another methyl group at the 17th position, like M1T or M-Dien. However you may wish to look at it, it is by this simple-looking transformation that Superdrol comes to occupy the sweet spot between the chemical natures of Anadrol and Masteron. Since it is already reduced at the 5th position, it cannot make estrogen. Progesterone is not an issue: perhaps 0.1% can aromatize, in theory. In fact, this compound should not have any major metabolites at all.
Anadrol/oxymetholone 17?hydroxy-2-hydroxymethylene-17a-methyl-5a-androstan-3-one
Superdrol/methasteron 2a,17a-Dimethyl-17?hydroxy-5a-androstan-3-one
Masteron/drostanolone 2a-methyl-17?-hydroxy-5a-androstan-3-one
Proviron/mesterolone 1a-methyl-17?-hydroxy-5a-androstan-3-one