Δαφνη Ευτυχια Αρθουρος

Ah! Thank you, and that makes a great deal of sense. I knew that isomers, even mere stereoisomers, mattered in biology, but it hadn't occurred to me that I was looking at a projection -- I thought there was maybe some new kind of bond I hadn't learned about in 11th grade or something. I'm relieved. Now that it's been explained, it seems nearly obvious (and, looking at the diagram of Topamax again, quite readable once one knows -- I can actually convince my brain to reinterpret the diagram as a three-dimensional image if I defocus my eyes a smidgen, which I didn't expect to happen so quickly).

Now off to Wikipedia to familiarize myself with the others so they won't seem so mysterious when I run across them.

Again, thanks.