Hi Jan

On Thu, Dec 19, 2013 at 11:32 PM, Jan Holst Jensen 
<j...@biochemfusion.com>wrote:

>
> The first lines of C:/temp/big.mol are:
>
> HERCEPTIN FAB (ANTIBODY) - LIGHT CHAIN
>      RDKit          3D
>
> 78908023  0  0  0  0  0  0  0  0999 V2000
>    34.5390   88.7520   88.2980 N   0  0  0  0  0  0  0  0  0  0  0  0
>    34.7910   87.4610   89.0350 C   0  0  2  0  0  0  0  0  0  0  0  0
>    35.9070   86.7790   88.2540 C   0  0  0  0  0  0  0  0  0  0  0  0
>
>
> which is unreadable since there are 7890 atoms and 8023 bonds and V2000
> format supports max. 999 atoms/bonds. I would have expected RDKit to switch
> to V3000 format automatically (?). I don't see any parameter in
> MolToMolBlock() that can force V3000 output ?
>

That's a perfectly reasonable expectation, but, unfortunately, the RDKit
has a "small" hole in the functionality it provides: there is no V3000 mol
block writer. I just added the feature request in github and will try to
get it in for the next release.

Sorry for the inconvenience.
-greg
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