Discrepancy found in oxygen          derivative?

I love this concept! Here's how I might do it:

Sexual discrimination is an element of estrogen derogation

Something differentiating Reg and Peg, perhaps
There has to be an &lit lurking in there somewhere, but I can't find it.

Expose unequal pay at brand clothing store

Put two and two together to resolve this?

Spoiler: http://preview.tinyurl.com/...