Tough one that's hard to qualify. It smells and taste somewhat similar to ALCAR (much much cheaper material), but will be even more sour, with a harsher "bite"
Other than that, open a capsule and dump out to powder. Leave it exposed to air for a day or two. If there isn't too much filler in there, it will pick up an extreme amount of moisture from the air, and might even turn semi-liquid - like a goo. ALCAR won't pick up as much ambient moisture.