| Summary of outstanding warrants by expiration date | 
  
|  |  |  | Exercise |  | Expiration |  
| Quantity |  |  | Price |  | Date |  
|  |  |  |  |  |  |  
|  | 5,000 |  |  | $ | 15.00 |  | April 1, 2013 |  
|  | 50,000 |  |  | $ | 3000 |  | April 1, 2013 |  
|  | 2,200,000 |  |  | $ | 3.00 |  | April 27, 2013 |  
|  | 500,000 |  |  | $ | 5.00 |  | August 10, 2013 |  
|  | 500,000 |  |  | $ | 7.50 |  | August 10, 2013 |  
|  | 500,000 |  |  | $ | 10.00 |  | August 10, 2013 |  
|  |  |  |  | $ | 3.00 |  | August 25, 2013 |  
|  | 10,000 |  |  | $ | 51.50 |  | August 25, 2013 |  
|  | 1,277,170 |  |  | $ | 1.66 | * | July 13, 2014 |  
|  | 65,000 |  |  | $ | 1.00 |  | September 14, 2014 |  
|  | 250,000 |  |  | $ | 1.50 |  | November 15, 2014 |  
|  | 20,000 |  |  | $ | 1.00 |  | December 2, 2014 |  
|  | 56,000 |  |  | $ | 1.00 |  | December 11, 2014 |  
|  | 5,000 |  |  | $ | 1.00 |  | December 28, 2014 |  
|  | 3,834 |  |  | $ | 30.00 |  | May 5, 2015 |  
|  | 100,000 |  |  | $ | 1.00 |  | October 10, 2015 |  
|  | 50,000 |  |  | $ | 1.00 |  | October 12, 2015 |  
|  | 500,000 |  |  | $ | 2.25 |  | October 25, 2015 |  
|  | 25,000 |  |  | $ | 2.25 |  | November 14, 2015 |  
|  | 100,000 |  |  | $ | 1.64 |  | December 13, 2015 |  
|  | 50,000 |  |  | $ | 20.00 |  | January 11, 2016 |  
|  | 5,000 |  |  | $ | 1.75 |  | March 19, 2016 |  
|  | 5,000 |  |  | $ | 1.75 |  | March 19, 2017 |  
|  | 250,000 |  |  | $ | 1.00 |  | June 28, 2017 |  
|  | 11,800 |  |  | $ | 1.00 |  | December 13, 2017 |  
|  | 5,000 |  |  | $ | 1.75 |  | March 19, 2018 |  
|  | 100,000 |  |  | $ | 1.00 |  | September 22, 2018 |  
|  | 11,295,968 |  |  | Total |  |  |  |