How many words are you willing to have in the response? Chirality, by definition, requires a lot of explanation to fully understand without implied context (chemistry, geometry).

I could offer this: "Ni ol brendonsefiik" (not as the spectre of the mirror), but that doesn't provide all the context you need for such a technical term as "chirality". 

As an alternative approach, I'll look up the "word origin" (etymology). Chiral comes from Greek word for "hand" (haal in Dovahzul). So, perhaps you could try "Vomed haalle" (un-like hands), "hands" referring to what the original users of "chiral" were going for when they were describing symmetry -- by comparing it to left/right hands (concept of mirror is spoken in terms of hands).

Final answer (my favorite): "Chiral (adj) ___" - "Vomed-halle ___" (___ is what's chiral). This should hopefully communicate "the hands are not like each other". It doesn't say anything about the comparing the mirror sides of the Carbon atom, but it's what we got.