achiral

Oh, and bonus points if you know what happens if a catalyst makes the transition states achiral

Scientists' Responses Solicited James F. McGrath 2008

The successful candidate will develop chiral and achiral

Naturejobs - All Jobs 2010

But I do like it when my biology colleagues have the broad outlines - that molecules with chiral centers, other things being equal, are often harder to make than achiral structures, that sticking a lot of cycloalkyl grease on a molecule is asking for metabolic trouble (no matter what it does for the potency in the assays), what sorts of things tend to make a molecule more (or less) soluble, and so on.

In the Pipeline 2010