Exhibit 99.2

JOINT FILING AGREEMENT

The undersigned acknowledge and agree that the foregoing statement on Schedule 13D is filed on behalf of each of the undersigned and that all subsequent amendments to this statement on Schedule 13D shall be filed on behalf of each of the undersigned without the necessity of filing additional joint filing agreements, The undersigned acknowledge that each shall be responsible for the timely filing of such amendments, and for the completeness and accuracy of the information concerning him or it contained herein and therein, but shall not be responsible for the completeness and accuracy of the information concerning the others, except to the extent that he or it knows or has reason to believe that such information is inaccurate,

ABC BETEILIGUNGEN AKTIENGESELLSCHAFT
By:	/s/ Rolf Birkert
	Rolf Birkert
DEUTSCHE BALATON BIOTECH AG
By:	/s/ Rolf Birkert
	Rolf Birkert
PRISMA EQUITY AG
By:	/s/ Rolf Birkert
	Rolf Birkert
SPARTA AG
By:	/s/ Jens Jüttner
	Jens Jüttner
HEIDELBERGER BETEILIGUNGSHOLDING AG
By:	/s/ Ralph Bieneck
	Ralph Bieneck
MARNA BETEILIGUNGEN AG
By:	/s/ Hansjörg Plaggemars
	Hansjörg Plaggemars
MING LE SPORTS AG
By:	/s/ Hansjörg Plaggemars
	Hansjörg Plaggemars
ALTECH ADVANCED MATERIALS AG
By:	/s/ Hansjörg Plaggemars
	Hansjörg Plaggemars
DEUTSCHE BALATON AKTIENGESELLSCHAFT
By:	/s/ Rolf Birkert
	Rolf Birkert

VV BETEILIGUNGEN AKTIENGESELLSCHAFT
By:	*
	Wilhelm Konrad Thomas Zours
STRAWTEC GROUP AG
By:	/s/ Hansjörg Plaggemars
	Hansjörg Plaggemars
DELPHI UNTERNEHMENSBERATUNG AKTIENGESELLSCHAFT
By:	*
	Wilhelm Konrad Thomas Zours
Hansjörg Plaggemars
/s/ Hansjörg Plaggemars
RALPH BIENECK
/s/ Ralph Bieneck
ROLF BIRKERT
/s/ Rolf Birkert
WILHELM KONRAD THOMAS ZOURS
*

* By:	/s/ Philipp Wiedmann
	Name: Philipp Wiedmann
	Title: Attorney-in-fact