Thanx alot for the reply. It was a great help to me.
Prasun
PRASUN (ASHOKA)
Desire + stability = Resolution
Resolution + Hard work = Success
On Tue, Dec 18, 2012 at 11:02 AM, Geoffrey Hutchison <
geoff.hutchi...@gmail.com> wrote:
> the atom type should be 'Car' as it is for Benzene molecule.
> thanx a lot
>
>
> Your molecule is an 18 electron species --
> Cyclooctadecanonaene<http://en.wikipedia.org/wiki/Cyclooctadecanonaene> or
> [18]annulene.
>
> Open Babel does not consider annulenes above 14 atoms as aromatic. The
> limit is in place, partly due to performance reasons, and partly because
> there's not a huge amount of experimental evidence that [18]annulene is any
> more aromatic than the corresponding polyacetylene linear oligomer.
>
> -Geoff
>
>
>
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