Not in a rush, page-6

The 1% break fee is payable by ACX to Oracle.

From the announcement:

Under the Scheme Implementation Deed, Aconex will be bound by customary exclusivity provisions including “no shop”, “no talk” (subject to the Aconex Directors’ fiduciary obligations), and “notification” obligations as well as “matching” rights. A break fee of approximately 1% of the equity value will be payable to Oracle by Aconex in certain circumstances.