JOINT FILING AGREEMENT

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/ Xxxx Xxxxxxx
		Xxxx Xxxxxxx
	DEUTSCHE BALATON BIOTECH AG
	By:	/s/ Xxxx Xxxxxxx
		Xxxx Xxxxxxx
	PRISMA EQUITY AG
	By:	/s/ Xxxx Xxxxxxx
		Xxxx Xxxxxxx
	SPARTA AG
	By:	/s/ Xxxx Xxxxxxx
		Xxxx Xxxxxxx
	XXXXXXXXXXXX BETEILIGUNGSHOLDING AG
	By:	/s/ Xxxxx Xxxxxxx
		Xxxxx Xxxxxxx
	XXXXX BETEILIGUNGEN AG
	By:	/s/ Xxxxxxxx Xxxxxxxxxx
		Hansjörg Xxxxxxxxxx
	XXXX LE SPORTS AG
	By:	/s/ Xxxxxxxx Xxxxxxxxxx
		Xxxxxxxx Xxxxxxxxxx
	ALTECH ADVANCED MATERIALS AG
	By:	/s/ Xxxxxxxx Xxxxxxxxxx
		Xxxxxxxx Xxxxxxxxxx
	DEUTSCHE BALATON AKTIENGESELLSCHAFT
	By:	/s/ Xxxx Xxxxxxx
		Xxxx Xxxxxxx

	VV BETEILIGUNGEN AKTIENGESELLSCHAFT
	By:	*
		Xxxxxxx Xxxxxx Xxxxxx Zours
	STRAWTEC GROUP AG
	By:	/s/ Xxxxxxxx Xxxxxxxxxx
		Xxxxxxxx Xxxxxxxxxx
	DELPHI UNTERNEHMENSBERATUNG AKTIENGESELLSCHAFT
	By:	*
		Xxxxxxx Xxxxxx Xxxxxx Zours
	Xxxxxxxx Xxxxxxxxxx
	/s/ Xxxxxxxx Xxxxxxxxxx
	XXXXX XXXXXXX
	/s/ Xxxxx Xxxxxxx
	XXXX XXXXXXX
	/s/ Xxxx Xxxxxxx
	XXXXXXX XXXXXX XXXXXX ZOURS
	*

* By:	/s/ Xxxxxxx Xxxxxxxx
	Name: Xxxxxxx Xxxxxxxx
	Title: Attorney-in-fact