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Exhibit 21.1

Subsidiaries of Collegium Pharmaceutical, Inc.

Subsidiary
Jurisdiction of Incorporation
Collegium Securities Corporation
Massachusetts
BioDelivery Sciences International, Inc.
Delaware
Arius Pharmaceuticals, Inc.
Delaware
Arius Two, Inc.
Delaware
Ironshore Therapeutics, Inc.
Cayman Islands
Ironshore Pharmaceuticals & Development, Inc.
Cayman Islands
Ironshore Pharmaceuticals Inc.
Delaware
Ironshore Pharmaceuticals Canada Inc.
Canada