Except as provided in regulations, for purposes of this subsection, if the assets of the distributing corporation or any controlled corporation are acquired by a successor corporation in a transaction described in subparagraph (A), (C), or (D) of section
368
(a)(1) or any other transaction specified in regulations by the Secretary, the shareholders (immediately before the acquisition) of the corporation acquiring such assets shall be treated as acquiring stock in the corporation from which the assets were acquired.