Although we don't believe in timing the market or panicking over market movements, we do like to keep an eye on big changes -- just in case they're material to our investing thesis.

What: Shares of Durata Therapeutics (UNKNOWN:DRTX.DL), a biopharmaceutical company focused on developing therapies to treat infectious diseases and other forms of acute illness, surged as much as 75% after agreeing to be acquired by Actavis (NYSE:AGN) for nearly $675 million.

So what: According to the terms of the agreement, Durata shareholders will receive $23 per share in cash for each share they own, with Actavis kicking in up to an additional $5 per share if Dalvance, Durata's intravenously injected acute bacterial skin and skin structure infection (ABSSSI) drug which was approved by the Food and Drug Administration in May, meets certain regulatory and sales milestones. The move is being made to further diversify Actavis' growing infectious disease portfolio of products and fits with Actavis' near-term goal of bolstering its profitability through acquisitions.

Now what: The big key to whether or not this transaction makes sense (albeit $675 million is a drop in the bucket for Actavis compared to what it's been spending lately) is going to be Dalvance's label expansion and/or convenience factor. Dalvance is being developed as a single-dose regimen with a supplemental new drug filing for ABSSSI expected by mid-2015, which could make it the go-to ABSSSI drug based on convenience, and is also being explored as a treatment for hospitalized-acquired pneumonia and pediatric osteomyelitis. If Dalvance can successful gain these additional indications I'd suggest the likelihood of investors receiving the extra $5 per share, known as a contingent value right, is probably very good. Ultimately, I see the transaction modestly boosting Actavis' top and bottom line and Durata shareholders getting more than a fair premium following this buyout.

Sean Williams has no material interest in any companies mentioned in this article. You can follow him on CAPS under the screen name TMFUltraLong, track every pick he makes under the screen name TrackUltraLong, and check him out on Twitter, where he goes by the handle @TMFUltraLong.

The Motley Fool has no position in any of the stocks mentioned. Try any of our Foolish newsletter services free for 30 days. We Fools don't all hold the same opinions, but we all believe that considering a diverse range of insights makes us better investors. The Motley Fool has a disclosure policy.