That's between 11 and 12 I believe. After broner hit maidana after the bell. If it was anything performance enhancing, I doubt it would work in that short order (before the bell rang for the the 12th) and for 1 round. Would have done that after they went back to the corner for the opening bell if it was.

Due to the cheap shot after the bell, it's probably some smelling salt substitute. I think smelling salts are illegal in the corner so I wouldn't be surprised if it was something like a cotton ball dipped in ammonia or something.