Joint Filer Information
| Names: | Deerfield Mgmt, L.P., Deerfield Management Company, L.P., Deerfield Special Situations Fund, L.P., Deerfield Partners, L.P. and Deerfield International Master Fund, L.P. |
| Address: | 780 Third Avenue, 37th Floor New York, NY 10017 |
| Designated Filer: | James E. Flynn |
| Issuer and Ticker Symbol: | Zafgen, Inc. [ZFGN] |
Date of Event Requiring Statement: | February 9, 2016 |
The undersigned, Deerfield Mgmt, L.P., Deerfield Management Company, L.P., Deerfield Special Situations Fund, L.P., Deerfield Partners, L.P. and Deerfield International Master Fund, L.P. are jointly filing the attached Initial Statement of Beneficial Ownership on Form 3 with James E. Flynn with respect to the beneficial ownership of securities of Zafgen, Inc.
Signatures:
DEERFIELD MGMT, L.P.
By: J.E. Flynn Capital, LLC, General Partner
By: /s/ Jonathan Isler
Jonathan Isler, Attorney-In-Fact
DEERFIELD MANAGEMENT COMPANY, L.P.
By: Flynn Management LLC, General Partner
By: /s/ Jonathan Isler
Jonathan Isler, Attorney-In-Fact
DEERFIELD SPECIAL SITUATIONS FUND, L.P.
By: Deerfield Mgmt, L.P., General Partner
By: J.E. Flynn Capital, LLC, General Partner
By: /s/ Jonathan Isler
Jonathan Isler, Attorney-In-Fact
DEERFIELD PARTNERS, L.P.
By: Deerfield Mgmt, L.P., General Partner
By: J.E. Flynn Capital, LLC, General Partner
By: /s/ Jonathan Isler
Jonathan Isler, Attorney-In-Fact
DEERFIELD INTERNATIONAL MASTER FUND, L.P.
By: Deerfield Mgmt, L.P., General Partner
By: J.E. Flynn Capital, LLC, General Partner
By: /s/ Jonathan Isler
Jonathan Isler, Attorney-In-Fact