Private equity firm Blackstone’s (BX.N) and U.S. specialty material company Celanese (CE.N) have offered concessions in an attempt to address EU antitrust concerns over the planned merger of their acetone tow units.

The companies submitted their proposal on Feb. 26, a filing on the European Commission website showed on Tuesday.

The EU competition authority, which did not provide details in line with its policy, extended the deadline for its decision to April 26 from April 5.

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