EXHIBIT A JOINT FILING AGREEMENT

EXHIBIT A

JOINT FILING AGREEMENT

The undersigned agree that this Schedule 13D, and all amendments thereto, relating to the Common Stock of Larimar Therapeutics, Inc. shall be filed on behalf of the undersigned. 

	DEERFIELD PRIVATE DESIGN FUND III, L.P.
	By:	Deerfield Mgmt III, L.P., General Partner
	By:	X.X. Xxxxx Capital III, LLC, General Partner
	By:	/s/ Xxxxxxxx Xxxxx
	Name:	Xxxxxxxx Xxxxx
	Title:	Attorney-in-Fact
	DEERFIELD HEALTHCARE INNOVATIONS FUND, L.P.
	By:	Deerfield Mgmt HIF, L.P., General Partner
	By:	X.X. Xxxxx Capital HIF, LLC, General Partner
	By:	/s/ Xxxxxxxx Xxxxx
		Xxxxxxxx Xxxxx, Attorney-In-Fact
	DEERFIELD PRIVATE DESIGN FUND IV, L.P.
	By:	Deerfield Mgmt IV, L.P., General Partner
	By:	X.X. Xxxxx Capital IV, LLC, General Partner
	By:	/s/ Xxxxxxxx Xxxxx
	Name:	Xxxxxxxx Xxxxx
	Title:	Attorney-in-Fact
	DEERFIELD MGMT III, L.P.
	By:	X.X. Xxxxx Capital III, LLC, General Partner
	By:	/s/ Xxxxxxxx Xxxxx
	Name:	Xxxxxxxx Xxxxx
	Title:	Attorney-in-Fact
	DEERFIELD MGMT HIF, L.P.
	By:	X.X. Xxxxx Capital HIF, LLC, General Partner
	By:	/s/ Xxxxxxxx Xxxxx
		Xxxxxxxx Xxxxx, Attorney-in-Fact
	DEERFIELD MGMT IV, L.P.
	By:	X.X. Xxxxx Capital IV, LLC, General Partner
	By:	/s/ Xxxxxxxx Xxxxx
	Name:	Xxxxxxxx Xxxxx
	Title:	Attorney-in-Fact
	DEERFIELD MANAGEMENT COMPANY, L.P.
	By:	Xxxxx Management LLC, General Partner
	By:	/s/ Xxxxxxxx Xxxxx
	Name:	Xxxxxxxx Xxxxx
	Title:	Attorney-in-Fact
	XXXXX X. XXXXX
	/s/ Xxxxxxxx Xxxxx
	Xxxxxxxx Xxxxx, Attorney-in-Fact