UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

SCHEDULE 13G

Under the Securities Exchange Act of 1934

(Amendment No. 2)*

(Name of issuer)

(Title of class of securities)

(CUSIP number)

(Date of event which requires filing of this statement)

Check the appropriate box to designate the rule pursuant to which this Schedule is filed:

¨ Rule 13d-1(b)

x Rule 13d-1(c)

¨ Rule 13d-1(d)

The information required in the remainder of this cover page shall not be deemed to be “filed” for the purpose of Section 18 of the Securities Exchange Act of 1934 (“Act”) or otherwise subject to the liabilities of that section of the Act but shall be subject to all other provisions of the Act (however, see the Notes).

SCHEDULE 13G

Explanatory Note: As of December 31, 2011 (“Year-End”), Boxer Capital, LLC had shared ownership of the $81,890 principal amount of the Issuer’s 8% Unsecured Subordinated Convertible Promissory Notes due September 9, 2013 (the “April 2009 Notes”), $30,462 principal amount of the Issuer’s 8% Unsecured Subordinated Convertible Promissory Notes due September 9, 2013, and issued on September 4, 2009 (the “September 2009 Notes”), $1,473,619 principal amount of the Issuer’s 12% Senior Unsecured Convertible Promissory Notes due March 9, 2013 (the “B Notes”), $1,398,977 principal amount of the Issuer’s 12% Senior Unsecured Convertible Promissory Notes due March 9, 2013 (the “C Notes”), $1,450,657 principal amount of the Issuer’s 12% Senior Unsecured Convertible Promissory Notes due March 9, 2013 (the “D Notes”), $2,379,089 principal amount of the Issuer’s 12% Senior Unsecured Convertible Promissory Notes due March 9, 2013 (the “E Notes”), $1,373,227 principal amount of the Issuer’s 12% Senior Unsecured Convertible Promissory Notes due September 9, 2021 (the “G Notes”), and $1,600,000 principal amount of the Issuer’s 12% Senior Unsecured Convertible Promissory Notes due September 9, 2021, (the “H Notes”, along with the April 2009 Notes, the September 2009 Notes, the B Notes, the C Notes, the D Notes, the E Notes, and the G Notes, each a “Note” and collectively the “Notes”). The Notes can only be converted to the extent that, after such conversion, the Reporting Persons (as defined below) would beneficially own no more than 9.999% of the outstanding Common Shares (as defined below). Boxer Capital, LLC held, in the aggregate, $9,787,921 principal amount of the Notes convertible at a conversion price of $.001 per Common Share. See Item 4 below.

SCHEDULE 13G

Explanatory Note: As of Year-End, Boxer Asset Management Inc. had shared ownership of the $81,890 principal amount of the April 2009 Notes, $30,462 principal amount of the September 2009 Notes, $1,473,619 principal amount of the B Notes, $1,398,977 principal amount of the C Notes, $1,450,657 principal amount of the D Notes, $2,379,089 principal amount of the E Notes, $1,373,227 principal amount of the G Notes, and $1,600,000 principal amount of the H Notes. The Notes can only be converted to the extent that, after such conversion, the Reporting Persons would beneficially own no more than 9.999% of the outstanding Common Shares. Boxer Asset Management Inc. held, in the aggregate, $9,787,921 principal amount of the Notes convertible at a conversion price of $.001 per Common Share. See Item 4 below.

SCHEDULE 13G

Explanatory Note: As of Year-End, MVA Investors II, LLC (“MVA Investors II”), had sole ownership of $0 principal amount of any Notes. See Item 4 below.

SCHEDULE 13G

Explanatory Note: As of Year-End, MVA Investors, LLC (“MVA”) had sole ownership of $189,851 principal amount of the B Notes, $175,856 principal amount of the C Notes, $157,214 principal amount of the D Notes and $257,832 principal amount of the E Notes. The Notes can only be converted to the extent that, after such conversion, the Reporting Persons would beneficially own no more than 9.999% of the outstanding Common Shares. MVA Investors, LLC held, in the aggregate, $780,483 principal amount of the Notes, convertible at a conversion price of $.001 per Common Share. See Item 4 below.

SCHEDULE 13G

Explanatory Note: As of Year-End, Joseph Lewis had shared ownership of the $81,890 principal amount of the April 2009 Notes, $30,462 principal amount of the September 2009 Notes, $1,473,619 principal amount of the B Notes, $1,398,977 principal amount of the C Notes, $1,450,657 principal amount of the D Notes, $2,379,089 principal amount of the E Notes, $1,373,227 principal amount of the G Notes, and $1,600,000 principal amount of the H Notes. The Notes can only be converted to the extent that, after such conversion, the Reporting Persons would beneficially own no more than 9.999% of the outstanding Common Shares. Joseph Lewis held, in the aggregate, $9,787,921 principal amount of the Notes convertible at a conversion price of $.001 per Common Share. See Item 4 below.

This Amendment No. 2 (“Amendment No. 2”) amends and supplements the statement on Schedule 13G initially filed on March 15, 2010 (the “Original Filing”), as amended on February 14, 2011 (“Amendment No. 1”). The Original Filing, as amended, remains in effect except to the extent that it is amended, restated or superseded by information contained in this Amendment No. 2. Capitalized terms used and not defined in this Amendment No. 2 have the meanings set forth in the Original Filing, as amended. This Amendment No. 2 is being filed to reflect the Reporting Persons’ beneficial ownership of the Issuer’s outstanding Common Shares as of December 31, 2011.

   Item 4 is hereby amended and restated:

Boxer Capital, Boxer Management and Joseph Lewis owned $81,890 principal amount of the April 2009 Notes, $30,462 principal amount of the September 2009 Notes, $1,473,619 principal amount of the B Notes, $1,398,977 principal amount of the C Notes, $1,450,657 principal amount of the D Notes, $2,379,089 principal amount of the E Notes, $1,373,227 principal amount of the G Notes, and $1,600,000 principal amount of the H Notes.

MVA Investors II owned $0 principal amount of any Notes.

MVA owned of $189,851 principal amount of the B Notes, $175,856 principal amount of the C Notes, $157,214 principal amount of the D Notes and $257,832 principal amount of the E Notes.

Pursuant to the terms of the Notes, following the securities purchase agreement dated September 2, 2011 and the Eleventh Amendment Agreement between the issuer and certain accredited investors disclosed on the Issuer’s Current Report on Form 8-K, filed on December 16, 2011, the conversion price of each of the Notes is $.001. The Notes can only be converted to the extent that, after such conversion, the Reporting Persons would beneficially own no more than 9.999% of the Issuer’s outstanding Common Shares. Because Boxer Capital, Boxer Management, Joseph Lewis, and MVA, may be deemed to be a group pursuant to Rule 13d, their aggregate beneficial ownership of Common Shares underlying the Notes cannot exceed 9.999% of the Issuer’s outstanding Common Shares.

The Common Shares beneficially owned by Boxer Capital, Boxer Management and Joseph Lewis together with the Common Shares beneficially owned by MVA represent 9.999%* of the Issuer’s outstanding Common Shares.

MVA has the sole power to vote the Common Shares it beneficially owns. Boxer Capital, Boxer Management and Joseph Lewis do not have the sole power to vote or direct the vote of any Common Shares.

Boxer Capital, Boxer Management and Joseph Lewis have shared voting power with respect to the Common Shares they beneficially own. MVA does not have shared power to vote or direct the vote of any Common Shares.

MVA has the sole power to dispose of the Common Shares it beneficially owns. Boxer Capital, Boxer Management and Joseph Lewis do not have the sole power to dispose or direct the disposition of any Common Shares.

Boxer Capital, Boxer Management and Joseph Lewis have shared dispositive power with respect to the Common Shares they beneficially own. MVA does not have shared power to dispose of or direct the disposition of any Common Shares.

Solely with respect to MVA Investors II:

If this statement is being filed to report the fact that as of the date hereof the reporting person has ceased to be the beneficial owner of more than 5 percent of the class of securities, check the following x.

  (c) By signing below I certify that, to the best of my knowledge and belief, the securities referred to above were not acquired and are not held for the purpose or with the effect of changing or influencing the control of the issuer of the securities and were not acquired and are not held in connection with or as a participant in any transaction having that purpose or effect.

Exhibits

SIGNATURE

After reasonable inquiry and to the best of my knowledge and belief, I certify that the information set forth in this statement is true, complete and correct.