JOINT FILING AGREEMENT
Exhibit 99.1
In
accordance with Rule 13d-1(k)(1) promulgated under the Securities Exchange
Act of 1934, the undersigned agree to the joint filing of a Statement on
Schedule 13G (including any and all amendments thereto) with respect to the
Common Stock, $0.001 par value, of Penwest Pharmaceuticals Co. and further agree
to the filing of this agreement as an exhibit thereto. In addition,
each party to this Agreement expressly authorizes each other party to this
Agreement to file on its behalf any and all amendments to such Statement on
Schedule 13G.
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Date:
November 17, 2008
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TANG
CAPITAL PARTNERS, LP
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By:
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Tang
Capital Management, LLC
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Its:
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General
Partner
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By:
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/s/
Xxxxx X. Xxxx
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Name:
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Xxxxx
X. Xxxx
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Title:
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Manager
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TANG
CAPITAL MANAGEMENT, LLC
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By:
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/s/
Xxxxx X. Xxxx
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Name:
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Xxxxx
X. Xxxx
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Title:
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Manager
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/s/
Xxxxx X. Xxxx
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Name:
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Xxxxx
X. Xxxx
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