13D Filing: Caxton Corp and Strongbridge Biopharma PLC (SBBP)

AGENT’S SIGNATURE AND ACKNOWLEDGMENT OF APPOINTMENT:

I, Heath N. Weisberg, have read the foregoing
Power of Attorney. I am the person identified therein as agent and attorney-in-fact for the principal named therein.

I acknowledge my legal responsibilities.

/s/ Heath N. Weisberg

Heath N. Weisberg

STATE OF NEW YORK     )

                                         ) ss:

COUNTY OF NEW YORK  )

On the 9th day of May, 2013, before me, the
undersigned, personally appeared Heath N. Weisberg, personally known to me or proved to me on the basis of satisfactory evidence
to be the individual whose name is subscribed to the within instrument and acknowledged to me that he/she executed the same in
his/her capacity, and that by his/her signature on the instrument, the individual, or the person upon behalf of which the individual
acted, executed the instrument.

/s/ Cynthia Rosel Rivera

Notary Public