If you write out your molecules as SMILES strings, what do they look like?
It's possible you are missing some bonds.

On 24 October 2017 at 17:41, <peng...@yandex.com> wrote:

> Hi,
>
> I'm wondering how I can match hydronium ions (H3O+) and H5O2+ using SMARTS
> with
> OpenBabel. I created the OBMol object with only atomic number and
> coordinates
> information, and I tried using "[#8](~[#1])(~[#1])~[#1]",
> "[#8+](~[#1])(~[#1])~[#1]", and "[OH3+]" but none of them produced any
> matches.
> If I set atomic number for oxygen atoms to 6 (pretending they are carbon)
> when
> creating OBMol, and use "[#6](~[#1])(~[#1])~[#1]", then it does match
> successfully. Is there anything I'm doing wrong here?
>
> Thanks very much!
>
> Peng
>
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