A Standard Clause that allows merging parties to extend a transaction's drop-dead date if the parties are not able to satisfy closing conditions requiring antitrust approval under the Hart-Scott-Rodino (HSR) Act in the US or in other jurisdictions by that date. This Standard Clause discusses when parties may want to include this clause, how including this clause affects closing, and the potential effect of a delay in obtaining antitrust approval. This Standard Clause has integrated notes with important explanations and drafting tips.