Hi there,

I've been looking at bug PR#3448379. It's a failure in identifying a
serine when at the C-terminus, after calling --gen3d (it's labelled as
UNK).

As a simpler testcase, "obabel -:N[C@@H](CO)C(=O)N[C@@H](CO)C(=O)O
--gen3d -opdb" will cause the problem (two serines in a row). To speed
things up, you can comment out everything in gen3d after
"builder.Build(*pmol);".

The specific problem is that IdentifyResidue returns 0 in chains.cpp.
This is quite a complex area of the code (some sort of tree-like
parsing going on). If any of you are familiar with it, I'd appreciate
a hand here.

- Noel

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