Exhibit 24.1

                                POWER OF ATTORNEY

        The undersigned hereby constitutes and appoints each of Scott A.
Arenare, Timothy J. Curt and Steven G. Schneider, acting together or
individually, his/her true and lawful attorney-in-fact to:

        (1)     execute for and on behalf of the undersigned Forms 3, 4 and 5,
                together with any amendments thereto, in accordance with the
                Securities Exchange Act of 1934, as amended, and the rules
                thereunder;

        (2)     do and perform any and all acts for and on behalf of the
                undersigned which may be necessary or desirable to complete the
                execution of any such Forms and the filing thereof with the
                United States Securities and Exchange Commission and any other
                person as may be required by law; and

        (3)     take any other action of any type whatsoever in connection with
                the foregoing which, in the opinion of such attorney-in-fact,
                may be of benefit to, in the best interest of, or legally
                required by, the undersigned, it being understood that the
                documents executed by such attorney-in-fact on behalf of the
                undersigned pursuant to this power of attorney shall be in such
                form and shall contain such terms and conditions as such
                attorney-in-fact may approve in his discretion.

        The undersigned hereby grants to each such attorney-in-fact full power
and authority to do and perform all and every act and thing whatsoever
requisite, necessary and proper to be done in the exercise of any of the rights
and powers herein granted, with full power of substitution or revocation, hereby
ratifying and confirming all that such attorney-in-fact, or his substitute or
substitutes, shall lawfully do or cause to be done by virtue of this power of
attorney and the rights and powers herein granted. The undersigned acknowledges
that the foregoing attorneys-in-fact, in serving in such capacity at the request
of the undersigned, are not assuming any of the undersigned's responsibilities
to comply with the Securities Exchange Act of 1934, as amended.

        This power of attorney shall remain in full force and effect until
revoked in writing by the undersigned or his/her attorney-in-fact.

        IN WITNESS WHEREOF, the undersigned has executed this Power of Attorney
this 12th day of February, 2010.

                                        Signature: /s/ David Hui Li
                                                   -----------------------------
                                        Print Name: David Hui Li