What is com.DesignScience.DSMTTool
DesignScience are the ones making MathType – an application used by Microsoft Word to be able to type out complex math formulas and display them easily. If you have Microsoft Word installed on your Mac, I think that's what it is. I can't confirm this though, as I don't have MathType installed.

Edit: I'm trying to get someone from Mathematics to confirm it.
Edit 2: I was unable to get a confirmation for this, but I'm still pretty certain it belongs to MathType. Check in Word if you have MathType installed!